Final Review: Pulmonary Circulation Flashcards
The pulmonary artery and its branches are a _____ pressure and _____ flow system
Low pressure
High flow
About what % of blood is found in the lungs?
9%
The bronchial arteries are a _____ pressure and _____ flow system.
High pressure
Low flow
The difference between the mean pulmonary arterial and the diastolic pressures in the left atrium is _____ mmHg.
~7 mmHg
What is the mean normal pressure in the left atrium?
2 mmHg
What happens to the open capillaries in the lungs, during exercise, to increase blood flow?
Number increases 3x
Capillaries become more distended
Increase in pulmonary arterial pressure
What zone pattern do the apices of the lungs show at rest?
Zone 2
What zone pattern does the rest of the lung show at rest?
Zone 3
What does the physiological shunt cause?
Blood in systemic arteries to have less O2/dl than blood that has equilibrated with alveolar air
What does reduction of blood flow to a portion of the lung cause?
Lowers pCO2
Results in constriction of bronchi supplying that portion of lung
