4 – Lab The Tissue Level of Organization
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Transcript of 4 – Lab The Tissue Level of Organization
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PowerPoint® Lecture Presentations prepared byJason LaPresLone Star College—North Harris
4 – Lab The Tissue Level of Organization
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An Introduction to Tissues
• Learning Outcomes• 4-1 Identify the four major types of tissues in the
body and describe their roles.
• 4-2 Discuss the types and functions of epithelial tissue.
• 4-3 Describe the relationship between form and function for each type of epithelium.
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An Introduction to Tissues
• Learning Outcomes• 4-4 Compare the structures and functions of the
various types of connective tissues.
• 4-5 Describe how cartilage and bone function as a supporting connective tissue.
• 4-6 Explain how epithelial and connective tissues combine to form four types of tissue
membranes, and specify the functions of each.
• 4-7 Describe how connective tissue establishes the framework of the body.
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An Introduction to Tissues
• Learning Outcomes• 4-8 Describe the three types of muscle tissue and
the special structural features of each type.
• 4-9 Discuss the basic structure and role of neural tissue
• 4-10 Describe how injuries affect the tissues of the body.
• 4-11 Describe how aging affects the tissues of the body.
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An Introduction to Tissues
• Tissues
• Structures with discrete structural and functional properties
• Tissues in combination form organs, such as the heart or liver
• Organs can be grouped into 11 organ systems
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4-1 Four Types of Tissue
• Tissue
• Are collections of cells and cell products that perform specific, limited functions
• Four types of tissue
1. Epithelial tissue
2. Connective tissue
3. Muscle tissue
4. Neural tissue
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4-1 Four Types of Tissue
• Epithelial Tissue• Covers exposed surfaces
• Lines internal passageways
• Forms glands
• Connective Tissue• Fills internal spaces
• Supports other tissues
• Transports materials
• Stores energy 7
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4-1 Four Types of Tissue
• Muscle Tissue• Specialized for contraction
• Skeletal muscle, heart muscle, and walls of hollow organs
• Neural Tissue• Carries electrical signals from one part of the body
to another
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4-2 Epithelial Tissue
• Epithelia
• Layers of cells covering internal or external surfaces
• Glands
• Structures that produce secretions
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4-2 Epithelial Tissue
• Characteristics of Epithelia
• Cellularity (cell junctions)
• Polarity (apical and basal surfaces)
• Attachment (basement membrane or basal lamina)
• Avascularity
• Regeneration
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Figure 4-1 The Polarity of Epithelial Cells
Cilia
MicrovilliApicalsurface
Golgiapparatus
Nucleus
MitochondriaBasement membraneBasolateralsurfaces 11
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4-2 Epithelial Tissue
• Functions of Epithelial Tissue
1. Provide Physical Protection
2. Control Permeability
3. Provide Sensation
4. Produce Specialized Secretions (glandular epithelium)
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4-3 Classification of Epithelia
• Singular = Epithelium; Plural = Epithelia
• Classes of Epithelia
1. Based on shape
• Squamous epithelia — thin and flat
• Cuboidal epithelia — square shaped
• Columnar epithelia — tall, slender rectangles
2. Based on layers
• Simple epithelium — single layer of cells
• Stratified epithelium — several layers of cells 13
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Table 4-1 Classifying Epithelia
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Table 4-1 Classifying Epithelia
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4-3 Classification of Epithelia
• Squamous Epithelia• Simple squamous epithelium
• Absorption and diffusion
• Mesothelium
• Lines body cavities
• Endothelium
• Lines heart and blood vessels
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Figure 4-3a Squamous Epithelia
Simple Squamous Epithelium
Lining of peritoneal cavityConnective tissue
Nucleus
Cytoplasm
LOCATIONS: Mesothelia lining ventral body cavities; endothelia lining heartand blood vessels; portions of kidney tubules (thin sections of nephron loops); inner lining of cornea; alveoli of lungs
FUNCTIONS: Reduces friction; controls vessel permeability; performsabsorption and secretion
LM 238
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4-3 Classification of Epithelia
• Squamous Epithelia
• Stratified squamous epithelium
• Protects against attacks
• Keratin protein adds strength and water resistance
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Figure 4-3b Squamous Epithelia
LOCATIONS: Surface of skin; lining of mouth, throat, esophagus, rectum, anus, and vagina
FUNCTIONS: Provides physical protection against abrasion, pathogens, and chemical attack
Surface of tongue
Squamoussuperficial cells
Stem cellsBasementmembraneConnective
tissueLM 310
Stratified Squamous Epithelium
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4-3 Classification of Epithelia
• Cuboidal Epithelia• Simple cuboidal epithelium
• Secretion and absorption
• Stratified cuboidal epithelia
• Sweat ducts and mammary ducts
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Figure 4-4a Cuboidal and Transitional Epithelia
Simple Cuboidal Epithelium
LOCATIONS: Glands; ducts;portions of kidney tubules; thyroidgland
FUNCTIONS: Limited protection,secretion, absorption
Kidney tubule
Connectivetissue
Nucleus
Cuboidalcells
Basementmembrane
LM 650
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Figure 4-4b Cuboidal and Transitional Epithelia
LOCATIONS: Lining of some ducts(rare)
FUNCTIONS: Protection, secretion,absorption
LM 500
Lumenof duct
Sweat gland duct
Stratifiedcuboidal
cellsBasementmembrane
Nuclei
Connectivetissue
Stratified Cuboidal Epithelium
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Simple Cuboidal Epithelium
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4-3 Classification of Epithelia
• Transitional Epithelium• Tolerates repeated cycles of stretching and recoiling
and returns to its previous shape without damage
• Appearance changes as stretching occurs
• Situated in regions of the urinary system (e.g., urinary bladder)
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Figure 4-4c Cuboidal and Transitional Epithelia
Transitional Epithelium
FUNCTIONS: Permitsexpansion and recoilafter stretching
LOCATIONS: Urinarybladder; renal pelvis;ureters
LM 400
Urinary bladder
LM 400
Empty bladder
Epithelium(relaxed)
Connective tissue andsmooth muscle layers
Epithelium(stretched)
Connective tissue andsmooth muscle layers
Basement membrane
Full bladder
Basement membrane
LM 400
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Transitional Epithelium
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4-3 Classification of Epithelia
• Columnar Epithelia
• Simple columnar epithelium
• Absorption and secretion
• Pseudostratified columnar epithelium
• Cilia movement
• Stratified columnar epithelium
• Protection
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Figure 4-5a Columnar Epithelia
LOCATIONS: Lining ofstomach, intestine, gallbladder,uterine tubes, and collectingducts of kidneysFUNCTIONS: Protection,secretion, absorption
Simple Columnar Epithelium
Microvilli
Cytoplasm
Intestinal lining
Basementmembrane
Looseconnective tissue LM 350
Nucleus
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Simple Columnar Epithelium
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Figure 4-5b Columnar Epithelia
LOCATIONS: Lining ofnasal cavity, trachea, andbronchi; portions of malereproductive tract
FUNCTIONS: Protection,secretion, move mucuswith cilia
Pseudostratified Ciliated Columnar Epithelium
Cilia
Trachea
Cytoplasm
Nuclei
Basementmembrane
Looseconnective tissue
LM 350
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Pseudostratified Ciliated Columnar Epithelium
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Figure 4-5c Columnar Epithelia
LOCATIONS: Small areas ofthe pharynx, epiglottis, anus,mammary glands, salivarygland ducts, and urethra
FUNCTION: Protection
Stratified Columnar Epithelium
Salivary gland duct
Deeper basalcells
Looseconnective tissue
Superficialcolumnar cells
Cytoplasm
Nuclei
Basementmembrane
LumenLumen
LM 175
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4-3 Classification of Epithelia
• Glandular Epithelia
• Endocrine glands
• Release hormones
• Into interstitial fluid
• No ducts
• Exocrine glands
• Produce secretions
• Onto epithelial surfaces
• Through ducts35
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4-3 Classification of Epithelia
• Glandular Epithelia
• Gland Structure
• Unicellular glands
• Mucous (goblet) cells are the only unicellular exocrine glands
• Scattered among epithelia
• For example, in intestinal lining
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4-3 Classification of Epithelia
• Gland Structure • Multicellular glands
1. Structure of the duct
• Simple (undivided)
• Compound (divided)
2. Shape of secretory portion of the gland
• Tubular (tube shaped)
• Alveolar or acinar (blind pockets)
3. Relationship between ducts and glandular areas
• Branched (several secretory areas sharing one duct) 37
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Figure 4-7 A Structural Classification of Exocrine Glands
SIMPLE GLANDS
Glandcells
SIMPLETUBULAR
SIMPLE COILEDTUBULAR
Examples:
Examples:
Examples:• Intestinal glands • Merocrine sweat
stage in developmentof simple branchedglands
SIMPLE BRANCHEDTUBULAR
Examples:• Gastric glands• Mucous glands
• Not found in adult; a
SIMPLE ALVEOLAR(ACINAR)
SIMPLE BRANCHEDALVEOLAR
Examples:• Sebaceous (oil)
glandsof esophagus,tongue, duodenum
glands
Duct
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Figure 4-7 A Structural Classification of Exocrine Glands
COMPOUND GLANDS
COMPOUNDTUBULAR
COMPOUND ALVEOLAR(ACINAR)
COMPOUND TUBULOALVEOLAR
Examples:• Mucous glands (in mouth) Examples:• Bulbo-urethral glands (in
male reproductive system)
tubules)
• Mammary glandsExamples:
• Salivary glands• Glands of respiratory
passages• Testes (seminiferous• Pancreas
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4-4 Connective Tissue
• Characteristics of Connective Tissue
1. Specialized cells
2. Solid extracellular protein fibers
3. Fluid extracellular ground substance
• The Extracellular Components of Connective Tissue (Fibers and Ground Substance)
• Make up the matrix• Majority of tissue volume
• Determines specialized function40
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4-4 Connective Tissue
• Functions of Connective Tissue
• Establishing a structural framework for the body
• Transporting fluids and dissolved materials
• Protecting delicate organs
• Supporting, surrounding, and interconnecting other types of tissue
• Storing energy reserves, especially in the form of triglycerides
• Defending the body from invading microorganisms41
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4-4 Connective Tissue
• Classification of Connective Tissues
1. Connective tissue proper
• Connect and protect
2. Fluid connective tissues
• Transport
3. Supporting connective tissues
• Structural strength
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4-4 Connective Tissue
• Categories of Connective Tissue Proper
• Loose connective tissue
• More ground substance, fewer fibers
• For example, fat (adipose tissue)
• Dense connective tissue
• More fibers, less ground substance
• For example, tendons
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4-4 Connective Tissue
• Fibroblasts
• Fibrocytes
• Adipocytes
• Mesenchymal cells
• Macrophages
• Mast cells
• Lymphocytes
• Microphages
• Melanocytes
Connective Tissue Proper Cell Populations
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4-4 Connective Tissue
• Fibroblasts• The most abundant cell type
• Found in all connective tissue proper
• Secrete proteins and hyaluronan (cellular cement)
• Fibrocytes• The second most abundant cell type
• Found in all connective tissue proper
• Maintain the fibers of connective tissue proper
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4-4 Connective Tissue
• Adipocytes• Fat cells
• Each cell stores a single, large fat droplet
• Mesenchymal Cells• Stem cells that respond to injury or infection
• Differentiate into fibroblasts, macrophages, etc.
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4-4 Connective Tissue
• Macrophages• Large, amoeba-like cells of the immune system
• Eat pathogens and damaged cells
• Fixed macrophages stay in tissue
• Free macrophages migrate
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4-4 Connective Tissue
• Mast Cells• Stimulate inflammation after injury or infection
• Release histamine and heparin
• Basophils are leukocytes (white blood cells) that also contain histamine and heparin
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4-4 Connective Tissue
• Lymphocytes• Specialized immune cells in lymphatic (lymphoid)
system
• For example, lymphocytes may develop into plasma cells (plasmocytes) that produce antibodies
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4-4 Connective Tissue
• Microphages• Phagocytic blood cells
• Respond to signals from macrophages and mast cells
• For example, neutrophils and eosinophils
• Melanocytes• Synthesize and store the brown pigment melanin
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4-4 Connective Tissue
• Connective Tissue Fibers
1. Collagen fibers
2. Reticular fibers
3. Elastic fibers
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4-4 Connective Tissue
• Collagen Fibers
• Most common fibers in connective tissue proper
• Long, straight, and unbranched
• Strong and flexible
• Resist force in one direction
• For example, tendons and ligaments
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4-4 Connective Tissue
• Reticular Fibers
• Network of interwoven fibers (stroma)
• Strong and flexible
• Resist force in many directions
• Stabilize functional cells (parenchyma) and
structures
• For example, sheaths around organs
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4-4 Connective Tissue
• Elastic Fibers
• Contain elastin
• Branched and wavy
• Return to original length after stretching
• For example, elastic ligaments of vertebrae
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4-4 Connective Tissue
• Ground Substance
• Is clear, colorless, and viscous
• Fills spaces between cells and slows pathogen
movement
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Figure 4-8 The Cells and Fibers of Connective Tissue Proper
Reticularfibers
MelanocyteFixed
macrophage
Plasma cell
Bloodin vessel
Adipocytes(fat cells)
Groundsubstance
Mast cell
Elasticfibers
Freemacrophage
Collagenfibers
Fibroblast
Mesenchymalcell
Lymphocyte
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Figure 4-8 The Cells and Fibers of Connective Tissue Proper
Elasticfibers
Collagenfibers
Fibroblast
Freemacrophage
Connective tissue proper LM 50257
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4-4 Connective Tissue
• Embryonic Connective Tissues
• Are not found in adults
• Mesenchyme (embryonic stem cells)
• The first connective tissue in embryos
• Mucous connective tissue
• Loose embryonic connective tissue
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Areolar or Loose Connective Tissue
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Figure 4-9a Connective Tissues in Embryos
Mesenchymalcells
Mesenchyme
This is the first connectivetissue to appear in an embryo.
LM 136
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Figure 4-9b Connective Tissues in Embryos
Mesenchymalcells
Blood vessel
Mucous connective tissue(Wharton’s jelly)
LM 136
This sample was taken fromthe umbilical cord of a fetus.
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4-4 Connective Tissue
• Loose Connective Tissues
• The “packing materials” of the body
• Three types in adults
1. Areolar
2. Adipose
3. Reticular
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4-4 Connective Tissue
• Areolar Tissue
• Least specialized
• Open framework
• Viscous ground substance
• Elastic fibers
• Holds blood vessels and capillary beds
• For example, under skin (subcutaneous layer)
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4-4 Connective Tissue
• Adipose Tissue• Contains many adipocytes (fat cells)
• 2 types of adipose tissue
1. White fat
2. Brown fat
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4-4 Connective Tissue
• White fat• Most common • Stores fat• Absorbs shocks• Slows heat loss (insulation)
• Brown fat• More vascularized • Adipocytes have many mitochondria• When stimulated by nervous system, fat breakdown accelerates,
releasing energy • Absorbs energy from surrounding tissues
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4-4 Connective Tissue
• Adipose Tissue
• Adipose cells
• Adipocytes in adults do not divide
• Expand to store fat
• Shrink as fats are released
• Mesenchymal cells divide and differentiate
• To produce more fat cells
• When more storage is needed
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Adipose Tissue
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4-4 Connective Tissue
• Reticular Tissue
• Provides support
• Complex, three-dimensional network
• Supportive fibers (stroma)
• Support functional cells (parenchyma)
• Reticular organs
• Spleen, liver, lymph nodes, and bone marrow
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Figure 4-10a Adipose and Reticular Tissues
Adipose Tissue
LOCATIONS: Deep to the skin,especially at sides, buttocks,breasts; padding around eyesand kidneysFUNCTIONS: Providespadding and cushionsshocks; insulates(reduces heat loss);stores energy
Adipose tissue
Adipocytes(white adipose
cells)
LM 300
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Figure 4-10b Adipose and Reticular Tissues
Reticular Tissue
FUNCTIONS: Provides supportingframework
LOCATIONS: Liver, kidney, spleen,lymph nodes, and bone marrow
Reticular tissuefrom liver
Reticular Tissue
Reticular fibers
LM 375
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Reticular Tissue
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4-4 Connective Tissue
• Dense Connective Tissues
• Connective tissues proper, tightly packed with high
numbers of collagen or elastic fibers
• Dense regular connective tissue
• Dense irregular connective tissue
• Elastic tissue
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Dense Regular Connective Tissue
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4-4 Connective Tissue
• Dense Regular Connective Tissue
• Tightly packed, parallel collagen fibers
• Tendons attach muscles to bones
• Ligaments connect bone to bone and stabilize organs
• Aponeuroses attach in sheets to large, flat muscles
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Figure 4-11a Dense Connective Tissues
Dense Regular Connective Tissue
Collagenfibers
Fibroblastnuclei
Tendon LM 440
LOCATIONS: Between skeletalmuscles and skeleton (tendonsand aponeuroses); betweenbones or stabilizing positionsof internal organs (ligaments);covering skeletal muscles;deep fasciae
FUNCTIONS: Providesfirm attachment; conductspull of muscles; reducesfriction between muscles;stabilizes relative positionsof bones
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4-4 Connective Tissue
• Dense Irregular Connective Tissue• Interwoven networks of collagen fibers
• Layered in skin
• Around cartilages (perichondrium)
• Around bones (periosteum)
• Form capsules around some organs (e.g., liver, kidneys)
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Figure 4-11b Dense Connective Tissues
Collagenfiber
bundles
Deep dermis LM 111
Dense Irregular Connective Tissue
LOCATIONS: Capsules ofvisceral organs; periosteaand perichondria; nerveand muscle sheaths; dermisFUNCTIONS: Providesstrength to resist forcesapplied from manydirections; helpsprevent overexpansionof organs such asthe urinary bladder
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4-4 Connective Tissue
• Elastic Tissue
• Made of elastic fibers
• For example, elastic ligaments of spinal vertebrae
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Figure 4-11c Dense Connective Tissues
Elasticfibers
Fibroblastnuclei
Elastic ligament
Elastic Tissue
LOCATIONS: Between vertebraeof the spinal column (ligamentumflavum and ligamentum nuchae);ligaments supporting penis;ligaments supporting transitionalepithelia; in blood vessel walls FUNCTIONS: Stabilizespositions of vertebrae andpenis; cushions shocks;permits expansion andcontraction of organs
LM 887
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Elastic Tissue
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4-4 Connective Tissue
• Fluid Connective Tissues
• Blood and lymph
• Watery matrix of dissolved proteins
• Carry specific cell types (formed elements)
• Formed elements of blood
• Red blood cells (erythrocytes)
• White blood cells (leukocytes)
• Platelets81
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4-4 Connective Tissue
• Fluid Elements of Connective Tissues
• Extracellular
• Plasma
• Interstitial fluid
• Lymph
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Figure 4-12 Formed Elements of the Blood
Red blood cells
Red blood cells account for roughlyhalf the volume ofwhole blood andgive blood its color.
Red blood cells, orerythrocytes(e-RITH-ro-sıts), areresponsible for the transport of oxygen (and, to a lesser degree, of carbon dioxide) in the blood.
¯ ¯
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Figure 4-12 Formed Elements of the Blood
White blood cells
Eosinophil
Neutrophil
Basophil
White blood cells, or leukocytes(LOO-ko-sıts; leuko-, white), help defend the body from infection and disease.
¯ ¯
Eosinophils and neutro-phils are phagocytes. Ba-sophils promote inflamma-tion much like mast cells in other connective tissues.
Lymphocytes are un-common in the bloodbut they are the domi-nant cell type in lymph,the second type of fluid connective tissue.
Monocytesare phagocytessimilar to thefree macro-phages inother tissues.
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Figure 4-12 Formed Elements of the Blood
PlateletsPlatelets aremembrane-enclosedpackets of cytoplasmthat function in bloodclotting.
These cell fragmentsare involved in theclotting responsethat seals leaks indamaged or brokenblood vessels.
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4-4 Connective Tissue
• Lymph
• Extracellular fluid
• Collected from interstitial space
• Monitored by immune system
• Transported by lymphatic (lymphoid) system
• Returned to venous system
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4-4 Connective Tissue
• Fluid Tissue Transport Systems
• Cardiovascular system (blood)
• Arteries
• Capillaries
• Veins
• Lymphatic (lymphoid) system (lymph)
• Lymphatic vessels
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4-5 Supporting Connective Tissues
• Support Soft Tissues and Body Weight
• Cartilage
• Gel-type ground substance
• For shock absorption and protection
• Bone
• Calcified (made rigid by calcium salts, minerals)
• For weight support
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4-5 Supporting Connective Tissues
• Cartilage Matrix
• Proteoglycans derived from chondroitin sulfates
• Ground substance proteins
• Chondrocytes (cartilage cells) surrounded by
lacunae (chambers)
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4-5 Supporting Connective Tissues
• Cartilage Structure
• No blood vessels
• Chondrocytes produce antiangiogenesis factor
• Perichondrium
• Outer, fibrous layer (for strength)
• Inner, cellular layer (for growth and maintenance)
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Figure 4-13a The Growth of Cartilage
Interstitial growth
Chondrocyte undergoes divisionwithin a lacuna surrounded bycartilage matrix.
As daughter cells secrete additional matrix, theymove apart, expanding the cartilage from within.
LacunaChondrocyte
MatrixNew matrix
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Figure 4-13b The Growth of Cartilage
Appositional growth
As the matrix enlarges, morechondroblasts are incorporated;they are replaced by divisions ofstem cells in the perichondrium.
These immaturechondroblasts secretenew matrix.
New matrix
ImmaturechondrocyteOlder matrixMaturechondrocyte
FibroblastDividing stem cell
Perichondrium
Cells in the cellular layerof the perichondriumdifferentiate intochondroblasts.
Chondroblasts
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4-5 Supporting Connective Tissues
• Types of Cartilage
1. Hyaline cartilage
2. Elastic cartilage
3. Fibrocartilage (fibrous cartilage)
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4-5 Supporting Connective Tissues
• Hyaline Cartilage
• Stiff, flexible support
• Reduces friction between bones
• Found in synovial joints, rib tips, sternum, and trachea
• Elastic Cartilage
• Supportive but bends easily
• Found in external ear and epiglottis 94
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4-5 Supporting Connective Tissues
• Fibrocartilage (Fibrous Cartilage)
• Limits movement
• Prevents bone-to-bone contact
• Pads knee joints
• Found between pubic bones and intervertebral discs
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Figure 4-14a Types of Cartilage
Hyaline Cartilage
LOCATIONS: Between tips of ribs and bones of sternum; covering bone surfaces at synovial joints; supporting larynx (voice box), trachea, and bronchi; forming part of nasal septumFUNCTIONS: Provides stiff butsomewhat flexible support;reduces frictionbetween bonysurfaces
Hyaline cartilageLM 500
Matrix
Chondrocytesin lacunae
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Hyaline Cartilage
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Figure 4-14b Types of Cartilage
Elastic CartilageLOCATIONS: Auricle of externalear; epiglottis; auditory canal;cuneiform cartilages of larynxFUNCTIONS: Provides support,but tolerates distortion withoutdamage andreturns tooriginal shape
Elastic cartilage
Elastic fibersin matrix
Chondrocytein lacuna
LM 358
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Elastic Cartilage
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Figure 4-14c Types of Cartilage
FibrocartilageLOCATIONS: Pads within kneejoint; between pubic bones ofpelvis; intervertebral discsFUNCTIONS: Resistscompression;prevents bone-to-bonecontact; limitsmovement
Fibrocartilage
Fibrousmatrix
Chondrocytesin lacunae
LM 400
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4-5 Supporting Connective Tissues
• Bone or Osseous Tissue• Strong (calcified calcium salt deposits)• Resists shattering (flexible collagen fibers)
• Bone Cells or Osteocytes• Arranged around central canals within matrix• Small channels through matrix (canaliculi) access
blood supply
• Periosteum • Covers bone surfaces• Fibrous layer• Cellular layer 101
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Figure 4-15 Bone
Canaliculi
Osteocytesin lacunae
Matrix
Central canal
Blood vessels
LM 375
Osteon
Osteon
Fibrouslayer
Cellularlayer
Periosteum
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Bone
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Table 4-2 A Comparison of Cartilage and Bone
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4-8 Muscle Tissue
• Muscle Tissue• Specialized for contraction
• Produces all body movement
• Three types of muscle tissue
1. Skeletal muscle tissue• Large body muscles responsible for movement
2. Cardiac muscle tissue• Found only in the heart
3. Smooth muscle tissue• Found in walls of hollow, contracting organs (blood
vessels; urinary bladder; respiratory, digestive, and reproductive tracts) 105
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4-8 Muscle Tissue
• Classification of Muscle Cells
• Striated (muscle cells with a banded appearance)
• Nonstriated (not banded; smooth)
• Muscle cells can have a single nucleus
• Muscle cells can be multinucleate
• Muscle cells can be controlled voluntarily (consciously)
• Muscle cells can be controlled involuntarily
(automatically)106
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4-8 Muscle Tissue
• Skeletal Muscle Cells
• Long and thin
• Usually called muscle fibers
• Do not divide
• New fibers are produced by stem cells (myosatellite
cells)
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Figure 4-18a Muscle Tissue
Skeletal Muscle Tissue
Skeletal muscle
Cells are long, cylindrical, striated, and multinucleate.LOCATIONS: Combinedwith connective tissuesand neural tissue inskeletal musclesFUNCTIONS: Moves orstabilizes the position ofthe skeleton; guardsentrances and exits tothe digestive,respiratory, and urinarytracts; generates heat;protects internal organs
Nuclei
Musclefiber
Striations
LM 180
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Skeletal Muscle
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4-8 Muscle Tissue
• Cardiac Muscle Cells
• Called cardiocytes
• Form branching networks connected at intercalated discs
• Regulated by pacemaker cells
• Smooth Muscle Cells
• Small and tapered
• Can divide and regenerate
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Figure 4-18b Muscle Tissue
Cardiac Muscle Tissue
Cardiac muscle
Cells are short, branched,and striated, usually with asingle nucleus; cells areinterconnected byintercalated discs.
FUNCTIONS:Circulates blood;maintains blood(hydrostatic) pressure
LOCATION: Heart
LM 450
Nucleus
Cardiacmuscle
cells
Intercalateddiscs
Striations
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Cardiac Muscle Tissue
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Figure 4-18c Muscle Tissue
Smooth muscle
Cells are short, spindle-shaped, andnonstriated, with a single, centralnucleus.LOCATIONS: Found inthe walls of blood vesselsand in digestive, respiratory,urinary, and reproductive organs
FUNCTIONS: Moves food,urine, and reproductive tractsecretions; controlsdiameter of respiratorypassageways; regulatesdiameter of blood vessels
LM 235
Nucleus
Smoothmuscle
cell
Smooth Muscle Tissue
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Smooth Muscle Tissue
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4-9 Neural Tissue
• Neural Tissue
• Also called nervous or nerve tissue
• Specialized for conducting electrical impulses
• Rapidly senses internal or external environment
• Processes information and controls responses
• Neural tissue is concentrated in the central nervous system
• Brain
• Spinal cord115
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Neural Tissue
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4-9 Neural Tissue
• Two Types of Neural Cells
1. Neurons
• Nerve cells
• Perform electrical communication
2. Neuroglia
• Supporting cells
• Repair and supply nutrients to neurons
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4-9 Neural Tissue
• Cell Parts of a Neuron
• Cell body
• Contains the nucleus and nucleolus
• Dendrites
• Short branches extending from the cell body
• Receive incoming signals
• Axon (nerve fiber)
• Long, thin extension of the cell body
• Carries outgoing electrical signals to their destination 118
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Figure 4-19 Neural Tissue
NEURONS NEUROGLIA (supporting cells)
• Maintain physical structure
• Repair tissue framework
• Perform phagocytosis
• Regulate the composition of theinterstitial fluid surrounding neurons
of tissues
after injury
• Provide nutrients to neurons
Axon
NucleolusNucleusof neuron
Dendrites(contacted byother neurons)
Axon (conductsinformation toother cells)
Cell body
Dendrites
MitochondrionNucleus
Microfibrils andmicrotubules
Nucleolus
Cell body (contains nucleusand major organelles) A representative neuron
(sizes and shapes vary widely)
Contact with other cells
Nuclei of neuroglia
LM 600
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© 2012 Pearson Education, Inc.
Figure 4-19 Neural Tissue
Axon
NucleolusNucleusof neuron
Cell body
Dendrites
Nuclei of neuroglia
LM 600
120
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© 2012 Pearson Education, Inc.
Figure 4-19 Neural Tissue
NEUROGLIA (supporting cells)
• Maintain physical structure
• Repair tissue framework
• Perform phagocytosis
• Regulate the composition of theinterstitial fluid surrounding neurons
of tissues
after injury
• Provide nutrients to neurons
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© 2012 Pearson Education, Inc.
Figure 4-19 Neural Tissue
Dendrites(contacted byother neurons)
Axon (conductsinformation toother cells)
MitochondrionNucleus
Microfibrils andmicrotubules
Nucleolus
Cell body (contains nucleusand major organelles) A representative neuron
(sizes and shapes vary widely)
Contact with other cells
122