Capillary Circulation Flashcards
Nutrient xchange
Glucose
O2
FFA
other
Water xchange
CO2
Lactate & ammonia
other metabolic by products
List the capillary characteristics that facilitate exchange processes
Thin wall one cell thick
High total surface area
Flow velocity slow due to large surface area more time to diffuse
Why > B flow to tissue is more advantageous.
By opening more capillaries velocity is decreased time to make nutrient xchange
Capillary Hydrostatic P
force in capillaries due to BP that tends to drive fluid outward through the endothelial pores
Interstitial fluid oncotic P
influence of proteins in the interstitial fluid “pulling” water out of capillaries
Capillary oncotic P
influence of proteins within the capillary lumen that keeps fluid in the capillaries
Interstitial fluid hydrostatic P
pressure in the interstitium that would drive fluid into the capillaries
Favor filtration
chP & ifoP
favors reabsorption
coP & ifhP
Decrease production of plasma proteins
Results in lowered coP
more filtration.
Excess filtrate usually picked up by the lymphatics
Vasodilation
Blood enter at high coP
more filtration
edema
obstruction in circulation venous clot
cause backup in P -> > BP
more filtration edema
Congestive Heart Failure
L ventricle not effective so increased pulmonary P
Fluid leaks out into lungs
Proteins leaking out of post capillary venule
More filtration
