Regulation of Art Resistance (SD)

Question 1

Darcy law

Answer 1

flow = pressure difference over resistance

Question 2

Mean arterial pressure equation

Answer 2

MAP = CO x TPR

Question 3

varying the radius of a blood vessel is a good way to control

Answer 3

resistance

Question 4

control of the radius of a blood vessels helps control the resistance and also controls the

Answer 4

mean arterial pressure

Question 5

Neurally - sympathetic nerves release noradrenaline which binds to

Answer 5

alpha 1 receptors to cause arteriolar constriction

therefore reducing Flow and increasing TPR

Question 6

Hormonally - extrinsic control is by the release of epinephrine - which binds to alpha 1 receptors to

Answer 6

cause arteriolar constriction

therefore reducing flow and increasing TPR

Question 7

Angiotensin II is produced in response to

Answer 7

low blood volume

Question 8

Angiotensin II causes

Answer 8

arteriolar constriction

therefore increased TPR

Question 9

Vasopressin (ADH) is released in response to

Answer 9

low blood volume

Question 10

vasopressin release causes

Answer 10

arteriolar constriction

Question 11

Atrial Natriuretic peptide is released in response to

Answer 11

high blood volume

Question 12

Atrial natriuretic peptide causes

Answer 12

arteriolar dilation

Question 13

active (metabolic) hyperaemia

Answer 13

increases metabolic activity (causing arteriolar dilation)