L 22 Circulation I - CIRCULATION I Diffusion not enough so...

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Diffusion not enough so need transport system for supply of O2, nutrients, excrete waste, keep pH and osmotic balance, supply heat, communicate (hormones), defend against organisms = CIRCULATORY SYSTEM CIRCULATORY SYSTEM = cardiovascular system (heart, arteries, veins, blood) + lymphatic vascular system (collects extravascular fluid returns it to vascular system CIRCULATION I
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Blood = plasma + cells CELLS = white blood cells (leukocytes) + red blood cells (erythrocytes) + platelets
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No nucleus in mammals, rest of vertebrate RBCs do have nucleus Last 120 days in humans
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White blood cells • lymphocytes – central role in immunology • monocytes – precursors of macrophages, phagocytic neutrophils - most common, acute inflammatory response to tissue injury – ingest and destroy microorganisms esp bacteria. • eosinophil – defense against parasites. • basophil – granules contain histamine – inflammatory response.
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HEMOPOIESIS = production of blood cells, by hemopoietic tissues. In adult mammals in bone marrow.
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L 22 Circulation I - CIRCULATION I Diffusion not enough so...

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