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Blood & Capillary Overview (Fig 23.13; p. 477)

Blood & Capillary Overview (Fig 23.13; p. 477). http://facstaff.gpc.edu/~jaliff/anablves.htm. http://focus.aps.org/story/v20/st21. Blood. Human Circ. System has 4-6 L. Cellular Elements represent 45% of total blood volume. RBCs & WBCs Plasma (Straw colored liquid)

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Blood & Capillary Overview (Fig 23.13; p. 477)

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  1. Blood & Capillary Overview(Fig 23.13; p. 477) http://facstaff.gpc.edu/~jaliff/anablves.htm http://focus.aps.org/story/v20/st21

  2. Blood • Human Circ. System has 4-6 L. • Cellular Elements represent 45% of total blood volume. • RBCs & WBCs • Plasma (Straw colored liquid) • Platelets (part of bone marrow cytoplasm)

  3. Plasma • Makes up over 1/2 of blood volume. • 90% is H2O • 10% is inorganic salts (ions, proteins, etc) • Ions = osmotic balance / pH balance • Proteins = • Blood clotting (fibrinogen) • Immunity (immunoglobulins)

  4. Capillaries • Thin enough for Transport of Substances between Blood and Interstitial Fluid. • Composed of epithelial cells.

  5. Transport of Substances(Fig. 23.12B; p. 476) • O2 & CO2 = Diffusion • Lgr. Molecules = Vesicles/Endocytosis /Exocytosis • H2O & Solutes = “Leaky clefts” • Proteins = Too Big to pass through

  6. Forces Transport of Substances • Blood Pressure - active force pushing fluid outward. • Osmotic Pressure - active force pulling fluid inward (*  [solute] in blood ).

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