TISSUES. Tissue: A Definition A group of connected, interdependent cells that cooperate to perform a...
-
Upload
brice-robinson -
Category
Documents
-
view
218 -
download
0
Transcript of TISSUES. Tissue: A Definition A group of connected, interdependent cells that cooperate to perform a...
TISSUES
Tissue: A DefinitionA group of connected, interdependent cells that cooperate to perform a specific function
Categories of Tissue1. Epithelial Tissue
2. Connective Tissue
3. Muscle Tissue
4. Nervous Tissue
Epithelial Tissues• General FeaturesCellular Layer +
Basement Membrane
Epithelial Tissues• General FeaturesCellular Layer + Basement Membrane
No Direct Circulation/Blood Supply
Touch Each Other
Rapid Rate of Cell Reproduction
Epithelial Tissues• Structural Classification
Cell Shapes
Columnar
Cuboidal
Squamous
Epithelial Tissues• Structural Classification
Cell Shapes
Cell Layers
Simple
Stratified
Epithelial Tissues• Major Types
Simple Squamous Epithelium
Simple Squamous EpitheliumFunction: Exchange
Sample Locations: Alveoli, capillaries
Stratified Squamous Epithelium
Stratified Squamous Epithelium
Function: Protection
Sample Locations: Skin, Mouth, Repro tracts
Simple Cuboidal Epithelium
Function: Absorption or Secretion
Sample Locations: Kidney, Hormone Glands
Simple Columnar Epithelium
Function: Absorption (or Secretion)
Sample Location: Digestive Tract
Microvilli
Simple ColumnarNote goblet cells
Pseudostratified Columnar Epithelium
Note cilia
Pseudostratified Columnar Epithelium
Pseudostratified Columnar EpitheliumFunction: Absorption, Secretion, Movement
Sample Locations: Respiratory & Repro Ducts
Transitional EpitheliumFunction: Stretchability
Sample Location: Urinary Bladder
What kind of tissue is this?
Epithelium cont.
• Epithelium that lines cavities sits on lamina propria.– Supports epithelium
– Binds epithelium to other tissue
– Provides nutrition
• Sides of cells are named– Basal
– Apical (free)
– Lateral
Basal Lamina-Lamina Propria
Intercellular Junctions
Belts that circle cell.ZO (tight junction) acts as barrier. ZA provides for adhesion of one cell to another
SpotsDes is like a spot welding.Gap allows passage of chemical for communication.
Gap Junction
Specializations of Cell Surface
• Microvilli– Found mainly on absorptive cells– Brush border, 1high
• Cilia / flagella– Cylindrical, motile structures, 5-10high– Contain microtubules– Basal bodies
Microvilli
Apical region of an intestinal epithelial cell seen with TEM. Filaments that constitute the core of the microvilli are clearly seen. An extracellular cell coat (glycocalyx) is bound to the plasmalemma of the microvilli. x45,000.
Cilia