8. Specialised Circulations

Question 1

What does circulation to an organ depend on?

Answer 1

Perfusion pressure

Vascular resistance

Question 2

What are the intrinsic factors of vascular resistance?

Answer 2

autoregulation- myogenic, metabolic and endothelial factors

mechanical compression

Question 3

What are the extrinsic factors?

Answer 3

nervous

Hormonal

Question 4

What is autoregulation?

Answer 4

The ability of organ to maintain blood flow despite changes in perfusion pressure

Question 5

When does autoregulation occur?

Answer 5

In the absence of extrinsic factors

Question 6

What are the features of coronary blood flow?

Answer 6

High basal flow 
High basal O2 consumption 
High myocardial O2 extraction 
High density of myocardial capillaries 
O2 transport increase by myoglobin myocytes

Question 7

Control of coronary blood flow

Answer 7

ccc

Question 8

What is neurohormonal control?

Answer 8

Action of sympathetic nerves and hormones

Question 9

What affects skeletal muscle circulation?

Answer 9

Sympathetic noradrenergic vasoconstrictior nerves
adrenaline
Sympathetic cholinergic vasodilators nerves
Compression

Question 10

still more to this

Answer 10

More to this