BRS CARDIOVASCULAR PHYSIOLOGY EXAM QUESTIONS AND ANSWERS WITH COMPLETE SOLUTIONS VERIFIED
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BRS PHYSIOLOGY
BRS CARDIOVASCULAR PHYSIOLOGY EXAM QUESTIONS AND ANSWERS WITH COMPLETE SOLUTIONS VERIFIED
cardiac output from the left side of the heart is ____ to the cardiac output from the right side of the heart.
equal
circulation of blood
what is stressed volume?
blood volume that is contained in the a...
brs cardiovascular physiology exam questions and a
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BRS CARDIOVASCULAR PHYSIOLOGY EXAM QUESTIONS AND
ANSWERS WITH COMPLETE SOLUTIONS VERIFIED
cardiac output from the left side of the heart is ____ to the cardiac output from
the right side of the heart.
equal
circulation of blood
what is stressed volume?
blood volume that is contained in the arteries
artery walls are thick walled containing extensive ____
elastic tissue and smooth muscle
where is the site of highest resistance in cardiovascular system?
arterioles
arteriolar resistance is regulated by _____
autonomic nervous system
arterioles with a1 adrenergic receptors are found in:
skin, splanchnic, and renal circulation
arterioles with B2 adrenergic receptors are found in:
skeletal muscle
what is the site of exchange (of nutrients, water, gasses) in the cardiovascular
system?
capillaries
,what vessels in the cardiovascular system have the largest cross
sectional/surface area?
capillaries
what vessels in the cardiovascular system contain the largest proportion of blood
at any given time? why?
veins; b/c they are thin walled and under low pressure, so they can hold more volume
(capacitance is higher due to low pressure)
what is unstressed volume?
blood volume contained in the veins
true or false: a1 adrenergic receptors are found in the venous system.
true, found in veins
calculate the velocity of blood flow
V=Q/A
V=velocity (cm/sec)
Q=blood flow (mL/min)
A=total cross sectional area (cm^2)
where does blood travel at a higher velocity: aorta or capillaries?
aorta [due to small cross sectional area (denominator is smaller)]
*recall V = Q/A
note: lower blood velocity in the capillaries optimizes conditions for exchange of
substances across the capillary wall
, calculate blood flow aka cardiac output
Q=∆P/R
cardiac output= (mean arterial pressure- right atrial pressure)/total peripheral resistance
Q=blood flow, cardiac output
P= pressure gradient
R= resistance
what drives the flow of blood through the cardiovascular system?
the pressure gradient (∆P); blood flows from high pressure to low pressure
poiseuille's equation (resistance of blood vessels)
R= (8nl)/(πr^4)
R= resistance
n= viscosity of blood
l=length of blood vessel
r= radius of blood vessel
How is resistance related to blood vessel radius?
inversely to the fourth power
if vessel radius decreases by a factor of two, resistance increases by a factor of 16.
true or false: if blood vessel size decreases by a factor of two, resistance
increases by a factor of 16
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