Physiology - Peripheral resistance Flashcards
smooth flow in layers , quickest at the centre of the lumen found in most vessels up to a critical velocity refers to which type of flow?
a. turbulent
b. laminar
b.laminar
disordered flow with extensive mixing , beyond critical velocity or past obstruction in which clots are more likely refers to which type of flow?
a. turbulent
b. laminar
a.turbulent
what happens to total reisistance when there is increased resistance in series?
a. decrease
b. no change
c. increase
c. increase
what happens to total reistance when there is increased resitances in parallel?
a. decrease
b. no change
c. increase
a.decrease
what does doppler flowmetry measure using the doppler shift of sound pulses bounced off blood cells?
a. speed
b. cardiac output
c. stroke volume
a.speed
what process involves sealing the arm in a watertight container, occluding venous drainage. Followed by measurement of volume change observed (proportional to rate of flow)
a. doppler flowmetry
b. thermistometry
c. venous occlusion plethysmography
c.venous occlusion plethysmography
what is the result if blood is not successfully directed to working tissues?
a. cyanosis
b. shock
c. arryhtmias
d. heart failure
b.shock
flow = cardiac output x radius4
/ 8 L n
is which law?
a. ficks
b. henrys
c. starling
d. hagen-poisseuille
d.hagen-poisseuille
which of these does not cause vasodilation in metabollically active tissues?
a. K+ / H+
b. adenosine
c. adrenaline
d. heat
e. EDRF
c.adrenaline
in order to maintain BP what must vasodilation in metabollically active tissues happen agasints a background of?
a. increased stroke volume
b. increased cardiac output
c. increased blood pressure
d. increased vasomotor stimulation
b.increased cardiac output
what happens to the precapillary sphincters during vasoilation?
a. open
b. close
a.open
what vasoconstrictor (most potent) is produced by the endothelium of blood vessels?
a. epinephrine
b. noradrenaline
c. endothelin
d. EDRF
c.endothelin
what vasodilator is produced by the endothelium of blood vessels?
a. epinephrine
b. noradrenaline
c. endothelin
d. EDRF
d.EDRF
endothelium derived relaxing factor
damage of what is indicated in strokes and coronary artery disease
a. endothelium
b. tunica adventitia
c. cardiac myocytes
a.endothelium
shock results from ..
a. low bp and inadequate peripheral perfusion
b. low cardiac output and inadequate peripheral perfusion
c
a.low bp and inadequate peripheral perfusion
