Video 6 Pulmonary Blood Flow

Question 1

What is pulmonary blood flow

Answer 1

Means by which oxygenated blood moves from the periphery to the body

Question 2

diff between pulmonary and systemic circulations (3)

Answer 2

1. Mean pressure is higher in systemic circulation
2. The systemic circulation has muscular arterioles that constrict and increase in diameter
3. VR on the systemic side is 10x that of pulmonary side

Question 3

Pressure in left atrium

Answer 3

5 mmHg

Question 4

vascular resistance =

Answer 4

delta P/flow

Question 5

What causes compression of capillaries?

Answer 5

Increased pressure in alveolar pressure

Question 6

Is this a pulmonary artery or vein?

Answer 6

It is a vein; It is not next to an airway

Question 7

Is the pressure around pulmonary veins Same as alveolar pressure?

Answer 7

No, the alveolar walls are under tension and pulling on the walls of the pulmonary vein, therefore the pressure is lower than alveolar pressure

Question 8

What is the difference between alveolar and extra-alveolar vessels?

Answer 8

alveolar vessels are mainly capillaries exposed to alveolar pressure; Extra-alveolar vessels are not exposed to alveolar pressure, contain some smooth muscle and have a tendency to get smaller

Question 9

What is this chart depecting

Answer 9

Increased arterial OR venous pressure decreases pulmonary VR

Question 10

What are the effects of increased capillary pressure? (2)

Answer 10

1. Recruitment
2. Distension

Question 11

What is recruitment?

Answer 11

capillaries open up and allow flow

Question 12

what is distension?

Answer 12

increase in width/size of the capillaries

Question 13

Blood flow near the base of the lung is _______ and increases/decreases? as we go up the lung

Answer 13

high
decreases

Question 14

T/F: Pulmonary blood flow is affected by posture

Answer 14

true

Question 15

3 nongravitational causes of uneven blood flow

Answer 15

1. Random variations in resistance of blood vessels
2. Proximal regions of acinus receive more blood flow than distal
3. Some regions of the lung have higher VR

Question 16

What is hypoxic pulmonary vasoconstriction

Answer 16

When the pulmonary VR greatly increases due to decreased concentrations of inspired oxygen

Question 17

Where is ACE found in the lungs?

Answer 17

Surface of the endothelial cells

Question 18

Examples of biological inactivation in the lungs

Answer 18

1. Bradykinin
2. Serotonin
3. Prostaglandins
4. NE (partially)

Question 19

What substance is secreted by the lungs?

Answer 19

Immunoglobulins