In the upright lung of a normal adult,which zone is considered to be gravity dependent?

Question

Quizplus · Accepted Answer

Zone 3 is considered to be gravity dependent in the upright lung of a normal adult. In this zone, blood flow is not obstructed by alveolar pressure and is dependent on gravity to maintain perfusion. The bottom of Zone 1 is also gravity dependent, but it is typically not considered as a separate zone. The top of Zone 2 is less gravity dependent than Zone 3, while the bottom of Zone 1 is more gravity dependent than Zone 2.

In the Upright Lung of a Normal Adult,which Zone Is