Pulmonary Circulation Flashcards Preview

CVRH Exam 3 > Pulmonary Circulation > Flashcards

Flashcards in Pulmonary Circulation Deck (12)
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1
Q

How are the bronchi drained?

A

Right to the azygos vein (small)
Left to the accessory hemiazygos vein (small)
Majority goes back with pulmonary veins to left atrium (right to left shunt)

2
Q

Why is the pulmonary circuit low pressure?

A

It only needs to pump blood to the top of the lungs and decreases edema

3
Q

What does a small increase in pulmonary arterial pressure lead to?

A

Large increase in compliance
Large decrease in pulmonary vascular resistance
Large increase in pulmonary capillary flow

4
Q

When is PVR lowest?

A

At functional residual capacity

5
Q

What are extra-alveolar vessels?

A

Vessels outside of the alveoli that are affected by the transmural pressure

6
Q

What occurs to extra-alveolar vessels with more negative intrapleural pressure?

A

Decreases resistance

7
Q

Why do hypoxic areas of the lungs not receive blood flow?

A

To shunt blood to areas of the lungs that are able to receive oxygen

8
Q

Why is pulmonary vascular resistance lowest at functional residual capacity?

A

Recruitment and distension of pulmonary capillaries

9
Q

What happens to areas of the lungs that are hypoxic and hypoventilated?

A

The arteries vasoconstrict

10
Q

What is the strongest signal for alveolar artery constriction?

A

Hypoxia (hypoxic vasoconstriction)

11
Q

An increase in what can cause pulmonary edema?

A

Hydrostatic pressure

12
Q

What secondary purpose can the lungs serve?

A

As a reservoir for particles from the LV before reaching the systemic circulation