How does the lung parenchyma receive most of its O2? a. From ...

[rosent76]

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]

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.

[rosent76]

Gracias!

[dyrone]

Thanks for the timely response, appreciate it