How does the lung parenchyma receive most of its O2?
a. From the alveolar gases
b. From the bronchial arteries/capillaries
c. From the pulmonary arteries/capillaries
d. From the pulmonary lymphatic system
ANS: A
A separate arterial supply called the bronchial circulation supplies blood to the airways from the trachea to the bronchioles and to most of the visceral pleurae. The metabolic needs of the lung are comparatively low, and much of the lung parenchyma is oxygenated by direct contact with in-spired gas.
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Fill in the blank(s) with the appropriate word(s).
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Fill in the blank(s) with the appropriate word(s).