Lecture 9 - Controlling regional blood flows

Question 1

What does high pressure allow

Answer 1

Full control of flow

Question 2

Cardiac output is ____ to all organs

So all the flows add up to…

Answer 2

distributed

5L/min

Question 3

Distribution of cardiac output during exercise

Increase in blood flows to:
3 (except….maximal exercise)

Decrease in blood flows to:
2

Constant blood flow to:
1

Answer 3

-

Question 4

How is MAP controlled during exercise?

Systemic circulation

• increases what?
• constant what?
• decreases what?

Individual circulations

• muscles - increase or decrease resistance?
• kidneys - increase or decrease resistance?

Answer 4

-

Question 5

What’s the formula for resistance and radius?

Answer 5

-

Question 6

Blood flow to an organ or region is controlled by adjusting what and what?

Answer 6

arteriolar (vascular) tone and radius

Question 7

So what have and haven’t you changed with change in space?

Answer 7

Changed amount/flow of blood due to change in size but no change in pressure

Question 8

What controls vascular resistance?

Answer 8

Mechanical - eg swelling
Neural - eg sympathetic nerves
Humoral - adrenalin