Vascular System

Question 1

At rest how much blood goes to the muscles and other organs?

Answer 1

15-20% to muscles
80-85% to other organs

Question 2

At exercise how much blood goes to the muscles and other organs?

Answer 2

80-85% to muscles
15-20% to other organs

Question 3

The percentage of blood is determined via vaso…

Answer 3

Vasodilation and Vasoconstriction

Question 4

How does vasodilation/ vasoconstriction work?

Answer 4

The smooth muscle may constrict causing the arterioles to have a smaller lumen reducing blood flow vice versa

Question 5

Explain what happens at the capillary bed.

Answer 5

Pre capillary sphincters block off flows and make the blood run through the central capillary rather than the peripheral. Therefore less blood travels through

Question 6

What is VR dependant on

Answer 6

SV

Question 7

How do you increase VR. List 5 things.

Answer 7

If blood is in superior vena cava then with GRAVITY it’ll fall back to the heart through veins
Invert the body (elevate legs)

Smooth muscle-> pulsating -> lumen reducing rhythmically

Pocket valves prevent back flow

Skeletal muscle pump - veins run through skeletal muscles-> when muscles contract they squeeze upon veins -> active recovery is better therefore

Respiratory pump - as thoracic cavity moves in and out during breathing the change in pressure causes veins to increase in pressure