Vascular Shunting Flashcards
What is vascular shunting?
It is the redistribution of blood flow from one area of the body to another
What do pre-capillary sphincters do?
Pre-capillary sphincters control the blood flow into the capillary beds
After exercise (at rest) what is the mechanism of vascular shunting?
A high percentage of cardiac output (blood) goes to the organs, whereas a very low percentage goes to the muscles
Why does a high percentage of blood go to the organs and a low percentage go to the muscle during vascular shunting?
The arterioles to the organs vasoDIOLATE, which increases blood flow
The arterioles to the muscles vasoCONSTRICT, which decreases the blood flow
Pre-capillary sphincters dilate —> open up, more blood flow to organ cells
Pre-capillary sphincters constrict —> close, less blood flow to muscle cells
During exercise, what is the mechanism of vascular shunting?
A high percentage of cardiac output (blood) goes to the muscles whereas a low percentage of blood goes to the organs
Why does a high percentage of blood go to the muscles during exercise and a low percentage go to the organs?
Arterioles to the organs vasoCONSTRICT, decreasing blood flow
Arterioles to the muscles vasoDIOLATE, which increases blood flow
Pre-capillary sphincters dilate —> open up, more blood flow to muscle cells
Pre-capillary sphincters constrict —> close, less blood flow to organ cells
