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Flashcards in Pulmonary Circulation Deck (9)
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0
Q

What can be described as low pressure/high flow system

A

pulmonary artery and its branches

1
Q

What % of blood volume is found in the lungs?

A

9% (450 mL)

2
Q

what can be described as high pressure/low flow system?

A

the bronchial arteries ( supplying the lung tissue itself)

3
Q

What is the pressure gradient in the pulmonary system?

A

The difference btw the mean pulmonary arterial pressure and the diastolic pressure in the left atrium …. the gradient is approximetly 7mm Hg

4
Q

What is the mean normal pressure in the left atrium?

A

2 mm Hg

5
Q

In order to increase blood flow to the lungs during excersise…

A

the number of open capillaries increases as much as 3X normal, the capillaries become more distended, and there is an increase in pulmonary arterial pressure.

6
Q

What are the zone pressures for the lung at rest?

A

The apices of the lungs has a zone 2 pattern of pulmonary blood flow, while the remainder of the lungs show a zone 3 pattern.

7
Q

Why do blood in the systemic arteries contain less oxygen per deciliter than blood that has equilibrated with the alveolar air?

A

The physiological shunt.

8
Q

What does a reduction of blood flow to a portion of the lung do?

A

Lowers alveolar pCO2 and results in a constriction of the bronchi supplying that portion of the lung.