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
pulse pressure is proportional to
stroke volume
pulse pressure is inversely proportional to
arterial compliance
as velocity increases, kinetic energy … and pressure energy …
increases; decreases
Describe aneurysm in terms of diameter, velocity, kinetic energy, and pressure energy
diameter increases, decrease velocity, decrease kinetic energy, increase pressure energy which further dilates vessel
According to Pascal’s Principle pressure is
the same in all regions at equilibrium
Wall tension (T) =
pressure (P) x radius (R)
when pressure is constant then wall tension is … and radius is …
increased; increased
