Vascular Shunt And The Regulation Of Heart Rate During Exercise And Recovery

Question 1

Define Vascular Shunt

Answer 1

The redistribution of Cardiac Output during exercise

Question 2

What do chemoreceptors do

Answer 2

Detect Changes in blood acidity

Question 3

What do Baroreceptors Do

Answer 3

Detect changes in blood pressure

Question 4

What do proprioceptors do

Answer 4

Detect changes in muscular activity

Question 5

What is the Vasomoter control centre

Answer 5

It is situated in the brain and controls the vascular shunt mechanism

Question 6

What does sympathetic simulation do

Answer 6

Controls the diameter of the arterioles and pre capillary sphincters

Question 7

What are pre capillary sphincters

Answer 7

A small muscle at the junction between arterioles and capillaries which can vasoconstrict/ vasodilate

Question 8

What is vasodilation

Answer 8

The widening of arterioles and pre capillary sphincters

Question 9

What is vasoconstriction

Answer 9

The narrowing of arterioles and pre capillary sphincters

Question 10

Describe the 4 stages of the vascular shunt mechanism during exercise

Answer 10

1) Chemoreceptors detect a change in PH, Baroreceptors detect an increase in blood pressure, Proprioreceptors detecy an increase in muscle activity
2) The information gets sent to the VCC
3) The VCC increases sympathetic stimulation of arterioles and pre capillary sphincters going to the organs which causes vasodilation and less blood flow
4) The VCC decrease sympathetic stimulation of arterioles and pre capillary sphincters going to the working muscles causing vasoconstriction and more blood flow