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Blood
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Composition and Function
Regulates pH and electrolyte levels Supplies cells with nutrients and oxygen Manufacture substances needed for defense against bacteria Ability to change from liquid to gel in clot formation for injury repair Classified into: Formed elements Plasma
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Formed Elements Red blood cells (erythrocytes) oxygen transport via hemoglobin White blood cells (leukocytes) phagocytes, scavenger cells that destroy foreign substances Eosinophils Basophils – release histamine Platelets injury mediators / blood clotting Normal bleeding time 0-7 min
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White Blood Cells
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Hematocrit Equivalent to the RBC concentration in the blood
Used to determine possible anemia Can you still be anemic with a normal RBC concentration? Yes
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Hemoglobin RBC protein responsible for oxygen transport
Measuring the hemoglobin can give you information on oxygen carrying capacity of the blood
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Cholesterol is carried in the blood
Atherosclerosis: disease in which blood vessels become increasingly occluded or blocked by plaques High cholesterol levels can lead to atherosclerosis Normal value: is mg per 100 ml of blood Good vs Bad Cholesterol HDL vs LDL
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Blood Typing – ABO & RH Blood type is genetically inherited
Based on the type of antigen marker molecules on surface of blood cells Rh surface antigen (D antigen) some people have it, some do not
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RhoGAM
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