Blood3 - (platelets). Production of Formed Elements o...

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Blood Functions of Blood Blood transports gases, nutrients, waste products, processed molecules, and hormones. Blood protects against disease and is involved in temperature, fluid, pH, and ion regulation. Blood clotting prevents fluid and cell loss and is part of tissue repair. Composition of Blood Blood is a connective tissue consisting of plasma and formed elements. Total blood volume is approximately 5 liters. Plasma Plasma is 91% water and 9% suspended or dissolved substances. Plasma maintains osmotic pressure, is involved in immunity, prevents blood loss, and transports molecules. Formed Elements The formed elements are cells (erythrocytes and leukocytes) and cell fragments
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Unformatted text preview: (platelets). Production of Formed Elements o Formed elements arise (hematopoiesis) in red bone marrow from stem cells. Erythrocytes o Erythrocytes are disk-shaped cells containing hemoglobin, which transports oxygen and carbon dioxide. Erythrocytes also contain carbonic anhydrase, which is involved with carbon dioxide transport. o In response to low blood oxygen levels, the kidneys produce erythropoietin, which stimulates erythrocyte production in red bone marrow. o Worn-out erythrocytes are phagocytized by macrophages in the spleen or liver. Hemoglobin is broken down, iron and amino acids are reused, and heme becomes bilirubin that is secreted in bile....
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