Physiology 2130 Lecture Notes - Lecture 9: Osmosis, Vagus Nerve, Urinary System
4 Oct 2017
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Physiology module 9: humans have a total blood volume (tbv) of 5 liters, 70% of which is in the veins, therefore also called capacitance vessels or (cid:498)blood reservoir(cid:499, arteries 10%, capillaries 5%, heart/lungs 15% Arteries: walls contain larger portion of elastic tissue to absorb pressure from heart contractions. Arterioles: mostly smooth muscle and are able to constrict or dilate to redirect blood to organs. Capillaries: completely endothelial cells to let substances in/out. Veins: walls thin and contain smooth and elastic tissue for more flexibility: small amount of muscle and presence of valves allows them to constrict. Venules: no smooth or elastic tissue since bp is low and function is to return blood to veins. Nfp (net filtration pressure: nfp = (pc pif) (pie p pie pif, positive numbers means filtration arterial end of capillary and moving back in at venous end, negative numbers mean reabsorption fluid is at.
