Author Question: How does the lung parenchyma receive most of its O2? a. From the alveolar gases b. From the ... (Read 66 times)

rosent76 · **on:** Jul 16, 2018

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

Question 2

Compared with the systemic circulation under normal conditions, pressure in the pulmonary cir-culation is:

a. higher.
b. lower.
c. the same.
d. not connected.

swimkari · **Reply #1 on:** Jul 16, 2018

Answer to Question 1

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.

Answer to Question 2

ANS: B
While the entire cardiac output passes through both pulmonary and systemic circuits, the pulmo-nary circulation offers much lower resistance and, as a result, has a much lower blood pressure.