Cardiovascular Regulation and Blood Flow Flashcards
1
Q
What vessel has the highest vascular resistance?
A
arterioles
2
Q
Pressure is ___ in veins than in arteries.
A
lower
3
Q
How does venoconstriction affect venous compliance?
A
decreases it
- inc pressure in veins
- inc pressure dif btwn peripheral veins and RA
- inc pressure gradient inc venous return to heart
4
Q
Is resistance in veins affected by venoconstriction?
A
no
5
Q
Velocity and CSA are ___ proportional.
A
inversely
6
Q
What is sheer stress?
A
friction on endothelial wall
7
Q
In healthy individuals, what is the response to sheer stress?
A
release nitric oxide to vasodilate vessel
8
Q
What is vascular tone?
A
degree of constriction of blood vessel (relative to max dilated state)
9
Q
What is active hyperemia?
A
blood flow increase is proportional to increase in metabolic activity
10
Q
What is reactive hyperemia?
A
blood flow is transiently increased following brief period of total ischemia
