Systemic&Pulmonary Circulations Part 2

Question 1

Vascular resistance is defined as the perfusion pressure divided by ?

Answer 1

Blood flow

Question 2

Large tubes: high flow and ____ resistance

Answer 2

Low

Question 3

Small tubes: low flow and ____ resistance

Answer 3

High

Question 4

What law is the resistance of a tube called?

Answer 4

Poiseuille’s Law

Question 5

The resistance of a single ________ is _____ than the resistance of a single capillary

Answer 5

Arteriole
Less

Question 6

The resistance of a single ________ is ________ than the resistance of a capillary network

Answer 6

Arteriole
Greater

Question 7

Why is the resistance of a article greater than resistance of capillary network?

Answer 7

Diameter of a capillary network is much larger than an arteriole
Small = greater resistance

Question 8

What is the capillary number per arteriole?

Answer 8

85

Question 9

What are the sites for not only the highest resistance in the circulation, but also of adjustable resistance?

Answer 9

Arterioles

Question 10

All of the organs are exposed to the ______ perfusion pressure

Answer 10

Same

Question 11

The differences in blood flow to various organs result from their different ________ resistances

Answer 11

Vascular

Question 12

The vascular resistance of an organ is determined by the _______ of the arterioles

Answer 12

Diameter

Question 13

Arterioles change their resistance, moment to moment, by changing their _______

Answer 13

Radius

Question 14

The wall of arterioles are _____ and muscular

Answer 14

Thick

Question 15

__________ of the arteriolar smooth muscle decreases the radius of arterioles

Answer 15

Contraction

Question 16

Arteriole vasodilation __________ blood flow in the brain

Answer 16

Increases

Question 17

Does the change in arteriole resistance increase or decrease the cardiac output?

Answer 17

Increases cardiac output

Question 18

What is the value of cardiac output during vigorous exercise? What muscle contributes the most- about 7.8%?

Answer 18

10
Skeletal muscle

Question 19

What is the normal cardiac output for a resting dog?

Answer 19

2.5 L/min

Question 20

What is the total peripheral resistance (TPR) of a resting dog?

Answer 20

38 mm Hg/L/min