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Blood & Capillary Overview (Fig 23.13; p. 477)
http://facstaff.gpc.edu/~jaliff/anablves.htmhttp://focus.aps.org/story/v20/st21
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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)
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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)
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Capillaries
• Thin enough for Transport of Substances between Blood and Interstitial Fluid.
• Composed of epithelial cells.
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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
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Forces Transport of Substances
• Blood Pressure - active force pushing fluid outward.
• Osmotic Pressure - active force pulling fluid inward
(* [solute] in blood ).