Capillary circulation

Question 1

How is blood flow regulated through capillaries?

Answer 1

Vasomotion via contraction of metaarterioles and precapillary sphincters

Question 2

Can capillaries contract or relax?

Answer 2

No

Question 3

What is the main stimulus for (increased) skeletal muscle blood flow regulation?

Answer 3

Decreased pO2 (hypoxia)

Question 4

What is the main stimulus for (increased) brain blood flow regulation?

Answer 4

Increased pCO2

Question 5

What is the main stimulus for (increased) heart blood flow regulation?

Answer 5

Increased adenosine

Question 6

How is filtration affected if hydrostatic pressure is greater than oncotic pressure?

Answer 6

Net filtration (fluid moves out of capillaries)

Question 7

What is the function of lymph with respect to interstitial pressures?

Answer 7

Keeps interstitial pressures low