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Unformatted text preview: Cardiac Output : volume of blood pumped/ min by each ventricle SV: blood pumped/ beat by each ventricle HR: # beats/ min CO= SV x HR *sympathetic nervous system has large control on Blood Volume- 2/3 intracellular compartment (nerve, muscle)-1/3 extracellular *80% of this is interstitial fluid *20% of this is blood plasma Exchange of Fluid between Capillaries and Tissues-distribution of ECF between blood and interstitial compartments is in state of equilibrium-movement out of capillaries is driven by hydrostatic pressure exerted against capillary wall -the oncotic pressure within the capillary causes fluid to move back in Overall Fluid Movement -determined by net filtration pressure and forces opposing it (Starling forces ) [fluid out] –[fluid in] (Pc+ I)–(Pi+ p) π π Pc = Hydrostatic pressure in capillary πi= Colloid osmotic pressure of interstitial fluid (proteins, electrolytes= want to move it toward) Pi= Hydrostatic pressure in interstitial fluid πp= Colloid osmotic pressure of blood plasma *normally filtration, osmotic reuptake, and lymphatic drainage maintain proper ECF levels-higher hydrostatic pressure at the arteriole (move out)-higher osmotic pressure at the venule (move in) *not all fluid reabsorbed, just what you need *usually the equilibrium is maintained by filtration, reuptake, and lymphatic drainage Edema = excessive accumulation of fluid resulting from:-venous obstruction (won't let you pull the water back in) *veins cannot return blood to the heart, so fluid goes somewhere else=...
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- Fall '10
- Hydrostatic Pressure, colloid osmotic pressure, total peripheral resistance, vascular resistance