Local Control Of Blood Flow Part 2

Question 1

A high level of oxygen causes ________ of pulmonary vessels
A high level of oxygen in systemic vessels causes __________

Answer 1

Dilation
Vasoconstriction

Question 2

C02, K, Adenosine, and metabolic acids are vaso________

Answer 2

Dilators

Question 3

What is released from endothelial cells and causes vascular smooth muscle to contract = vasoconstriction and decrease in blood flow?

Answer 3

ET-1

Question 4

What is stimulated by an increase in blood flow velocity past the endothelium and conducts vasodilation locally?

Answer 4

Nitric oxide

Question 5

What causes vasoconstriction and platelet aggregation?

Answer 5

TXA2

Question 6

What causes vasodilation and bleeding?

Answer 6

PG12

Question 7

Relative balance between TXA2 and PGI2 is more important than the absolute value of either chemical _____

Answer 7

Alone

Question 8

Histamine causes vaso_______

Answer 8

Dilation

Question 9

What may also be formed in sweat glands when they are activated by ACh released from sympathetic nerve endings?

Answer 9

Bradykinin

Question 10

Histamine and bradykinin exert their vasodilation effects by stimulating the formation of _____ oxide

Answer 10

Nitric

Question 11

What is an increase in tissue blow flow in response to increased metabolic rate?

Answer 11

Active hyperemia

Question 12

What is a temporary increase above normal in blood flow to the tissue after a period when blood flow was restricted?

Answer 12

Reactive hyperemia

Question 13

During reactive hyperemia, the metabolic products accumulate and the local concentration of oxygen _________

Answer 13

Decreases

Question 14

During reactive hyperemia, _________ of the arterioles and a decrease in arteriolar resistance occurs

Answer 14

Dilation

Question 15

What is a relative constancy of blood flow in an organ despite changes in perfusion pressure?

Answer 15

Autoregulation

Question 16

What is the range of perfusion pressures over which flow remains relatively constant called?

Answer 16

Autoregulatory range

Question 17

The same metabolic mechanism responsible for active hyperemia and reactive hyperemia also accounts for ____________

Answer 17

Autoregulation

Question 18

Metabolic control plays a major role in the _____________ of blood flow, in the critical tissues of the body

Answer 18

Autoregulation