Lecture 11

Question 1

what allows better control of blood flow?

Answer 1

higher pressure

Question 2

what is the design of the systemic circulation that allows cardiac output to be distributed to all organs?

Answer 2

parallel design

• continual branching of arterial networks

Question 3

what areas of the body have increased blood flow during exercise?

Answer 3

• muscle
• heart
• skin

Question 4

what areas of the body have decreased blood flow during exercise?

Answer 4

• GI tract
• Kidneys

Question 5

what areas of the body have constant blood flow in exercise and rest?

Answer 5

the brain

Question 6

How is MAP controlled during exercise?

Answer 6

• increased cardiac output
• decreased total peripheral resistance

this keeps balance and constant mean arterial pressure

Question 7

during exercise what happens to the resistance and flow of blood to muscle?

Answer 7

increased flow

decreased resistance

Question 8

during exercise what happens to the resistance and flow of blood to the kidneys?

Answer 8

decreased flow

increased resistance

Question 9

what is the resistance to blood flow proportional to?

Answer 9

1 divided by radius to the power of 4

Question 10

how does the diameter of blood vessel lumen change?

Answer 10

smooth muscle contracts (vasoconstriction) to shorten diameter

smooth muscle relaxes (vasodilation) to lengthen diameter