Blood Flow through the Vessels Flashcards
radius is the most important factor for determining
the rate of blood flow
resistance is
inversely related to radius to the power of 4
removal of an organ
increases peripheral vascular resistance
amputation/organ donor
decreased conductance, increased resistance
if tumors >50um develop collateral system
increased conductance, decreased resistance
for parallel blood flow the SVR is..
sum of the reciprocal of the resistance of all arteries, arterioles, capillaries, venules, veins
sympathetic stimulation causes
constriction, greater pressure required for given flow
sympathetic inhibition causes
dilation, greater flow for given pressure
the pressure flow relation of vessels depends on
their amount of muscular and elastic tissue
muscular tissue confers
contractility
elastic tissue confers
distensibility
veins are …
highly distensible
large arteries are…
distensible by a reflex myogenic contraction occurs
arterioles are…
where myogenic muscular contraction is highly developed so flow is constant (autoregulation)
pulse pressure =
systolic - diastolic pressure