Blood Lab 12 web - Blood only fluid tissue of body What...

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Blood – only fluid tissue of body Functions include, among others: Nutrient and waste management Heat management Body defenses What type of tissue is blood? Epithelial Connective Muscle Nerve
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Blood Composition Plasma – water (90%), proteins, gases, hormones, nutrients Formed elements – living cells Hematocrit - % of blood volume that is RBCs 47% ± 5% for males 42% ± 5% for females 1 Withdraw blood and place in tube. 2 Centrifuge the blood sample. Plasma 55% of whole blood Least dense component Buffy coat Leukocytes and platelets <1% of whole blood Erythrocytes 45% of whole blood Most dense component Formed elements
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Formed Elements Erythrocytes – red blood cells (RBCs), most abundant Leukocytes - White blood cells (WBCs), many different types Platelets – cell fragments, for blood clotting
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Leukocytes (a.k.a. WBCs) help defend the body against disease Leukocyte anatomy: Complete cells, have nucleus & organelles Can move in and out of blood vessels ( diapedesis) Respond to chemical signals from damaged/infected tissues
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Some Leukocyte (a.k.a. WBC) anatomy… Neutrophils – eat microbial pathogens, i.e. bacteria Basophils – signal tissue damage w/ histamine Eosinophils – kill parasites (worms), respond to allergies
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