A&P II – Chapter 17 – Summary of Formed Elements of the Blood – Flashcards
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Erythrocytes (RBC) Description
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Biconcave, anucleate disc; salmon-colored; diameter 7-8 micrometers
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Erythrocytes (RBC) Cells per microL (mm^3) of Blood
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4-6 million
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Erythrocytes (RBC) Duration of Development (D) and Life Span (LS)
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D: about 15 days LS: 100-120 days
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Erythrocytes (RBC) Function
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Transport oxygen and carbon dioxide
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Leukocytes (WBC) Description
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Spherical, nucleated cells
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Leukocytes (WBC) Cells per microL (mm^3) of Blood
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4,800-10,800
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Granulocytes
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Neutrophil, Eosinophil, Basophil
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Neutrophil Description
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Multilobed nucleus; inconspicuous cytoplasmic granules; diameter 10-12 micrometers
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Neutrophil Cells per microL (mm^3) of Blood
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3,000-7,000
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Neutrophil Duration of Development (D) and Life Span (LS)
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D: about 14 days LS: 6 hours to a few days
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Neutrophil Function
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Phagocytize bacteria
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Eosinophil Description
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Bilobed nucleus; red cytoplasmic granules; diameter 10-14 micrometers
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Eosinophil Cells per microL (mm^3) of Blood
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100-400
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Eosinophil Duration of Development (D) and Life Span (LS)
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D: about 14 days LD: about 5 days
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Eosinophil Function
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Kill parasitic worms; complex role in allergy and asthma
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Basophil Description
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Bilobed nucleus; large purplish-black cytoplasmic granules; diameter 10-14 micrometers
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Basophil Cells per microL (mm^3) of Blood
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20-50
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Basophil Duration of Development (D) and Life Span (LS)
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D: 1-7 days LS: a few hours to a few days
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Basophil Function
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Release histamine and other mediators of inflammation; contain heparin, an anticoagulant
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Agranulocytes
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Lymphocyte, Monocyte
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Lymphocyte Description
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Spherical or indented nucleus; pale blue cytoplasm; diameter 5-17 micrometers
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Lymphocyte Cells per microL (mm^3) of Blood
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1,500-3,000
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Lymphocyte Duration of Development (D) and Life Span (LS)
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D: days to weeks LS: hours to years
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Lymphocyte Function
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Mount immune response by direct cell attack or via antibodies
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Monocyte Description
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U- or kidney-shaped nucleus; gray-blue cytoplasm; diameter 14-24 micrometers
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Monocyte Cells per microL (mm^3) of Blood
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100-700
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Monocyte Duration of Development (D) and Life Span (LS)
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D: 2-3 days LS: months
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Monocyte Function
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Phagocytosis; develop into macrophages in the tissues
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Platelets Description
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Discoid cytoplasmic fragments containing granules; stain deep purple; diameter 2-4 micrometers
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Platelets Cells per microL (mm^3) of Blood
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150,000-400,000
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Platelets Duration of Development (D) and Life Span (LS)
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D: 4-5 days LS: 5-10 days
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Platelets Function
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Seal small tears in blood vessels; instrumental in blood clotting
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list the leukocytes in order from most abundant to least abundant
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Never (neutrophils) Let (lymphocytes) Monkeys (monocytes) Eat (eosinophils) Bananas (basophils)
