Vasomotor control and Vascular shunt Flashcards
1
Q
At rest where is blood going?
A
Other organs - 80-85%
Working Muscles - 15-20%
2
Q
During exercise
A
Other organs - 20%
Working muscles - 80%
3
Q
How does this happen?
A
- smooth muscle can vasodilato and vasoconstrict.
4
Q
Vasodilation
A
smooth muscles relaxes so lumen becomes wider
- arteries at rest are vasodilated.
5
Q
Vasoconstriction
A
lumen becomes narrower as the smooth muscle is contracting and more blood is pumped to the working muscles
6
Q
Vasomotor control centre
A
- located in the medulla oblongata
- sympathetic stimulation of arteriole - vasoconstriction
- parasympathetic stimulation of arteriole - vasodilation
7
Q
Neural information
A
chemoreceptors - PH levels decreased
baroreceptors - pressure increased
proprioceptors - movement increased.
8
Q
Vascular shunt mechanism
A
more blood goes the working muscles rather than bodily organs when exercising.
- this occurs through vasoconstriction (narrowing of arteries) and vasodilation (widening of arteries)
