functions of blood

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blood chapter 17 blood anatomy & physiology functions of blood transportation heat regulation composition of blood made of plasma & formed elements plasma: fluid portion of blood formed elements red blood cells (erythrocytes) white blood cells (leukocytes) platelets (thrombocytes) watch us blood cells clip hematocrit or packed cell volume (pcv) percent of red blood cells in whole blood buffy coat (less than 1%): white blood cells & platelets erythrocytes (rbcs) mature rbc has no nucleus, ribosomes, mitochondria small biconcave discs primary component: hemoglobin (1/3 of cell volume) flexible because of stretchable fibers called spectrin function of rbcs transportation of oxygen & carbon dioxide depends on hemoglobin & an enzyme carbonic anhydrase hemoglobin 200-300 million molecules of hemoglobin in each rbc each hemoglobin molecule contains 4 protein chains called globin & each chain is bound to a red pigment, heme, which each heme contains an iron molecule one hemoglobin molecule can …

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purple granules in cytoplasm function: cell defense by phagocytosis of microorganisms life span: hours to 3 days eosinophils usually 2 lobed nucleus large orange-red staining granules function: cellular defense usually against parasites & involved in allergic reactions life span: 10-12 days basophils usually 2 lobed nucleus sparse, large purple staining granules least numerous wbc function: secrete heparin & histamine life span: hours to 3 days lymphocytes smallest of wbc, about 25% of total wbc count large spherical nuclei with scant pale blue cytoplasm t-lymphocytes: directly attack infected or cancerous cell b-lymphocytes: produce antibodies against specific antigens life span: days to years monocytes largest of the wbc kidney bean shaped nuclei with large quantities of blue-gray cytoplasm phagocytic cell capable of ingesting bacteria, debris, cancerous cells in tissue called macrophages life span: months wbc formation neutrophils, eosinophils, basophils originate in bone marrow most lymphocytes & monocytes originate in lymphatic tissue watch …

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ag present on it own rbcs plasma does contain ab against those ag not present on its rbcs the rh system rh positive: rh antigen is present on rbcs rh negative: rbcs have no rh antigen blood does not normally contain anti-rh antibodies except thru previous transfusion or pregnancy blood plasma 90% water, 10 % solutes most of the solutes are proteins (formed by liver) albumin: help maintain osmotic balance globulins: immune mechanism fibrinogen: blood clotting remaining solutes are food substances, metabolic products, respiratory gases, hormones, etc coagulation four components critical to coagulation prothrombin thrombin fibrinogen fibrin three stages stage i stage ii stage iii stage i production of thromboplastin activator by either: extrinsic pathway: chemicals released from damaged tissues intrinsic pathway: chemicals present in the blood stage ii conversion of prothrombin to thrombin by the prothrombin activator produced in stage i stage iii conversion of fibrinogen to fibrin and …

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tp://faculty.une.edu/com/abell/histo/histolab3a.htm slide 16: medium lymphocyte, 12/27/06, http://www.anatomy.dal.ca/human_histology/lab7/61lo4.html slide 17: monocyte, 12/27/06, http://www.med-ed.virginia.edu/courses/path/innes/nh/wcbmaturation.cfm slide 21: megakaryocyte, 12/30/06, http://www.med-ed.virginia.edu/courses/path/innes/nh/platelets.cfm cb065581

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blood chapter 17 blood anatomy & physiology functions of blood transportation heat regulation composition of blood made of plasma & formed elements plasma: fluid portion of blood formed elements red blood cells (erythrocytes) white blood cells (leukocytes) platelets (thrombocytes) watch us blood cells clip hematocrit or packed cell volume (pcv) percent of red blood cells in whole blood buffy coat (less than 1%): white blood cells & platelets erythrocytes (rbcs) mature rbc has no nucleus, ribosomes, mitochondria small biconcave discs primary component: hemoglobin (1/3 of cell volume) flexible because of stretchable fibers called spectrin function of rbcs transportation of oxygen & carbon dioxide depends on hemoglobin & an enzyme carbonic anhydrase hemoglobin 200-300 million molecules of hem...

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