lecture3-1blood_vessels2007 - The cardiovascular system...

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1 The Cardiovascular (Circulatory) System The cardiovascular system consists of: blood , blood vessels , the lymph system , and the heart . Arteries Veins Its primary function is transport. h Water h Gases (e.g. oxygen, CO 2 ) h Nutrients (e.g. carbs, fats, proteins) h Heat h Hormones (e.g. adrenalin) h Waste products to kidneys (e.g. urea) h Cells and molecules of the immune system (white blood cells, antibodies) Components of the Blood A. Acellular components: Plasma (50-55%) B. Cellular components: - Erythrocytes (red blood cells) - Leucocytes (white blood cells) - Platelets (thrombocytes) The Plasma Consists of: s Water: 80-90% s Dissolved solids: 10% Blood proteins: serum globulin, serum albumin Nutrients: glucose, fats & fatty acids, amino acids, salt ions Cellular Products: enzymes, antibodies, hormones Waste products (urea, salts) Erythrocytes function as transport containers for hemoglobin (= oxygen transport molecule) Each erythrocyte contains approx. 280 million hemoglobin molecules.
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Erythrocytes are h nucleated and large in birds and fishes h small, anucleated in mammals h produced in hematopoietic (=blood forming) tissues. Hematopoietic tissues: • In fish: kidney, spleen, liver; • In birds and mammals: red bone marrow (yolk sac/liver in the developing embryo) Why does hemoglobin not float freely in the blood plasma? Leukocytes • nucleated, motile cells • can migrate through walls of blood vessels • important in the immune system: - phagocytosis of bacteria and dead cells - wound repair & inflammation - antibody production http://campus.murraystate.edu/academic/ faculty/Wade.Northington/leukocyt.htm There are 5 different types of leukocytes. Granular Leukocytes Agranular Leukocytes Neutrophils: most abundant group (60%), phagocytize bacteria & dead cells. Eosinophils: 2.3%; phagocytize antibody- antigen complexes. Basophils: least abundant (0.5%); contain histamine and heparin, important for vascular permeability and blood clotting time. Granular leukocytes are produced in the bone
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This note was uploaded on 09/23/2008 for the course APC 100 taught by Professor Kelliewhited during the Winter '07 term at UC Davis.

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lecture3-1blood_vessels2007 - The cardiovascular system...

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