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4 Cards in this Set
- Front
- Back
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Composition of Blood
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fluid connective tissue
plasma (nonliving fluid "matrix") Formed Elements Erythrocytes Leukocytes Platelets |
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Physical Characteristics of Blood
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• Sticky, opaque fluid
• Metallic taste due to iron in hemoglobin • Color varies with O2 content High O2 - scarlet; Low O2 - dark red • pH 7.35–7.45 • ~8% of body weight • Average volume 5–6 L for males; 4–5 L for females |
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Functions of Blood
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– Distributing substances
Oxygen, waste products and hormones – Regulation body temperature (thermal regulation) pH levels maintaining adequate fluid volume in circulatory system – Protection blood loss & infenction |
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Characteristics of Formed Elements
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Only WBCs are complete cells
RBCs have no nuclei or other organelles Platelets are cell fragments Most formed elements survive in bloodstream only few days - RBC's - a couple months - Platelets - a few days Most blood cells originate in bone marrow and do not divide -blood cells are pored out to blood stream when they mature - reticular tissue constantly giving rise to erythrocytes |
