Seventh Edition Elaine N. Marieb - Tripod.comsmithclassroom.tripod.com/Ch10Notes.pdf · damaged...
Transcript of Seventh Edition Elaine N. Marieb - Tripod.comsmithclassroom.tripod.com/Ch10Notes.pdf · damaged...
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Essentials of Human Anatomy & Physiology
Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
Slides 10.1 – 10.31
Seventh EditionElaine N. Marieb
Chapter 10Blood
Lecture Slides in PowerPoint by Jerry L. Cook
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BloodBlood
Slide 10.1aCopyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
• The only fluid tissue in the human body
• Classified as a connective tissue
•Living cells = formed elements
•Non-living matrix = plasma
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BloodBlood
Slide 10.1bCopyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
Figure 10.1
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Physical Characteristics of BloodPhysical Characteristics of Blood
Slide 10.2Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
• Color range
•Oxygen-rich blood is scarlet red
•Oxygen-poor blood is dull red
• pH must remain between 7.35–7.45
• Blood temperature is slightly higher than body temperature
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Blood PlasmaBlood Plasma
Slide 10.3Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
• 90% water
• Includes many dissolved substances
•Nutrients
•Salts (metal ions)
•Respiratory gases
•Hormones
•Proteins
•Waste products
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Plasma ProteinsPlasma Proteins
Slide 10.4Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
• Albumin – regulates osmotic pressure
• Clotting proteins – help to prevent blood loss when a blood vessel is injured
• Antibodies – help protect the body from antigens (foreign invaders)
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Formed ElementsFormed Elements
Slide 10.5aCopyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
• Erythrocytes = red blood cells
• Leukocytes = white blood cells
• Platelets = cell fragments
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Slide 10.5bCopyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
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Slide 10.5cCopyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
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Erythrocytes (Red Blood Cells)Erythrocytes (Red Blood Cells)
Slide 10.6Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
• The main function is to carry oxygen
• Anatomy of circulating erythrocytes
•Biconcave disks
•Essentially bags of hemoglobin
•Anucleate (no nucleus)
•Contain very few organelles
• There are 1000 RBCs to every 1 WBC
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Erythrocytes (Red Blood Cells)Erythrocytes (Red Blood Cells)
Slide 10.7Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
HemoglobinHemoglobin -- Iron-containing protein• Binds strongly, but reversibly, to oxygen
• Each hemoglobin molecule has four oxygen binding sites
• Each erythrocyte has 250 million hemoglobin molecules
• So, how many O2 can be carried by one red blood cell?
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Leukocytes (White Blood Cells)Leukocytes (White Blood Cells)
Slide 10.8Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
• Crucial in the body’s defense against disease
• These are complete cells, with a nucleus and organelles
• Able to move into and out of blood vessels (diapedesis)
• Can move by ameboid motion
• Can respond to chemicals released by damaged tissues
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Leukocyte Levels in the BloodLeukocyte Levels in the Blood
Slide 10.9Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
• Normal levels are between 4,000 and 11,000 cells per millimeter
• Abnormal leukocyte levels
•Leukocytosis
•Above 11,000 leukocytes/ml
•Generally indicates an infection
•Leukopenia
•Abnormally low leukocyte level
•Commonly caused by certain drugs
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Types of LeukocytesTypes of Leukocytes
Slide 10.10aCopyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
• Granulocytes
•Granules in their cytoplasm can be stained
• Include neutrophils, eosinophils, and basophils
Figure 10.4
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Types of LeukocytesTypes of Leukocytes
Slide 10.10bCopyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
• Agranulocytes
•Lack visiblecytoplasmicgranules
• Include lymphocytes andmonocytes
Figure 10.4
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GranulocytesGranulocytes
Slide 10.11aCopyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
• Neutrophils
•Multilobed nucleus with fine granules
•Act as phagocytes at active sites of infection
• Eosinophils
•Large brick-red cytoplasmic granules
•Found in repsonse to allergies and parasitic worms
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GranulocytesGranulocytes
Slide 10.11bCopyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
• Basophils
•Have histamine-containing granules
• Initiate inflammation
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AgranulocytesAgranulocytes
Slide 10.12Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
• Lymphocytes
•Nucleus fills most of the cell
•Play an important role in the immune response
• Monocytes
•Largest of the white blood cells
•Function as macrophages
• Important in fighting chronic infection
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PlateletsPlatelets
Slide 10.13Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
• Derived from ruptured multinucleate cells (megakaryocytes)
• Needed for the clotting process
• Normal platelet count = 300,000/mm3
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HematopoiesisHematopoiesis
Slide 10.14Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
• Blood cell formation
• Occurs in red bone marrow
• All blood cells are derived from a common stem cell (hemocytoblast)
• Hemocytoblast differentiation
•Lymphoid stem cell produces lymphocytes
•Myeloid stem cell produces other formed elements
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Fate of ErythrocytesFate of Erythrocytes
Slide 10.15Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
• Unable to divide, grow, or synthesize proteins
• Wear out in 100 to 120 days
• When worn out, are eliminated by phagocytes in the spleen or liver
• Lost cells are replaced by division of hemocytoblasts
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Control of Erythrocyte ProductionControl of Erythrocyte Production
Slide 10.16Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
• Rate is controlled by a hormone (erythropoietin)
• Kidneys produce most erythropoietin as a response to reduced oxygen levels in the blood
• Homeostasis is maintained by negative feedback from blood oxygen levels
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Control of Erythrocyte ProductionControl of Erythrocyte Production
Slide 10.17Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
Figure 10.5
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HemostasisHemostasis
Slide 10.18Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
• Stoppage of blood flow
• Result of a break in a blood vessel
• Hemostasis involves three phases
•Platelet plug formation
•Vascular spasms
•Coagulation
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Platelet Plug FormationPlatelet Plug Formation
Slide 10.19Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
• Collagen fibers are exposed by a break in a blood vessel
• Platelets become “sticky” and cling to fibers
• Anchored platelets release chemicals to attract more platelets
• Platelets pile up to form a platelet plug
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Vascular SpasmsVascular Spasms
Slide 10.20Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
• Anchored platelets release serotonin
• Serotonin causes blood vessel muscles to spasm
• Spasms narrow the blood vessel, decreasing blood loss
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CoagulationCoagulation
Slide 10.21aCopyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
• Injured tissues release thromboplastin
• PF3 (a phospholipid) interacts with thromboplastin, blood protein clotting factors, and calcium ions to trigger a clotting cascade
• Prothrombin activator converts prothrombin to thrombin (an enzyme)
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CoagulationCoagulation
Slide 10.21bCopyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
• Thrombin joins fibrinogen proteins into hair-like fibrin
• Fibrin forms a meshwork (the basis for a clot)
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Blood ClottingBlood Clotting
Slide 10.22Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
• Blood usually clots within 3 to 6 minutes
• The clot remains as endothelium regenerates
• The clot is broken down after tissue repair
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Undesirable ClottingUndesirable Clotting
Slide 10.23Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
• Thrombus
•A clot in an unbroken blood vessel
•Can be deadly in areas like the heart
• Embolus
•A thrombus that breaks away and floats freely in the bloodstream
•Can later clog vessels in critical areas such as the brain
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Bleeding DisordersBleeding Disorders
Slide 10.24Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
• Thrombocytopenia
•Platelet deficiency
•Even normal movements can cause bleeding from small blood vessels that require platelets for clotting
• Hemophilia
•Hereditary bleeding disorder
•Normal clotting factors are missing
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Blood Groups and TransfusionsBlood Groups and Transfusions
Slide 10.25Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
• Large losses of blood have serious consequences
•Loss of 15 to 30 percent causes weakness
•Loss of over 30 percent causes shock, which can be fatal
• Transfusions are the only way to replace blood quickly
• Transfused blood must be of the same blood group
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Human Blood GroupsHuman Blood Groups
Slide 10.26aCopyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
• Blood contains genetically determined proteins
• A foreign protein (antigen) may be attacked by the immune system
• Blood is “typed” by using antibodies that will cause blood with certain proteins to clump (agglutination)
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Human Blood GroupsHuman Blood Groups
Slide 10.26bCopyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
• There are over 30 common red blood cell antigens
• The most vigorous transfusion reactions are caused by ABO and Rh blood group antigens
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ABO Blood GroupsABO Blood Groups
Slide 10.27aCopyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
• Based on the presence or absence of two antigens
•Type A
•Type B
• The lack of these antigens is called type O
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ABO Blood GroupsABO Blood Groups
Slide 10.27bCopyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
• The presence of both A and B is called type AB
• The presence of either A or B is called types A and B, respectively
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Rh Rh Blood GroupsBlood Groups
Slide 10.28Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
• Named because of the presence or absence of one of eight Rh antigens (agglutinogen D)
• Most Americans are Rh+
• Problems can occur in mixing Rh+ blood into a body with Rh– blood
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Rh Rh Dangers During PregnancyDangers During Pregnancy
Slide 10.29aCopyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
• Danger is only when the mother is Rh–
and the father is Rh+, and the child inherits the Rh+ factor
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Rh Rh Dangers During PregnancyDangers During Pregnancy
Slide 10.29bCopyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
• The mismatch of an Rh– mother carrying an Rh+ baby can cause problems for the unborn child
•The first pregnancy usually proceeds without problems
•The immune system is sensitized after the first pregnancy
• In a second pregnancy, the mother’s immune system produces antibodies to attack the Rh+
blood (hemolytic disease of the newborn)