9 blood 118 - Biology 118 9 BLOOD Blood is a specialized...

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Biology 118 9. BLOOD Blood is a specialized connective tissue that carries out transport, the regulation of pH and electrolytes, blood clotting, immunity, and body temperature stabilization. BLOOD COMPOSITION: Blood is composed of plasma and formed elements. Plasma – mostly water, but full of crucial solutes and plasma proteins. Formed elements include red blood cells, white blood cells and platelets. ERYTHROCYTES : These are red blood cells, packed with the oxygen-carrying protein called hemoglobin. Hemoglobin is composed of the globin protein and heme, an organic molecule that coordinates an iron ion. The iron in heme can reversibly bind oxygen. Red blood cells have no nuclei, and hence cannot repair themselves, nor divide. They wear out in about 3 months, so have to be replaced. Aging red blood cells are phagocytosed by white blood cells, and most of the red blood cell components are recycled. Iron is recycled, but some is always lost – this iron must be replenished from dietary sources.
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This note was uploaded on 02/24/2011 for the course BIO 118 taught by Professor Bilgen during the Spring '08 term at University of Washington.

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9 blood 118 - Biology 118 9 BLOOD Blood is a specialized...

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