Air can be expired from the lungs only if alveolar pressure (increases or decreases) to a (Higher or Lower) level than (atmospheric or intrathoracic) pressure.

PULMONARY PHYSIOLOGY

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Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]

A	increases higher intrathoracic
B	decreases lower intrathoracic
C	increase higher atmospheric
D	increase lower atmosphercic

Explanation:

Detailed explanation-1: -During expiration, the relaxation of the diaphragm and elastic recoil of tissue decreases the thoracic volume and increases the intraalveolar pressure.

Detailed explanation-2: -Alveolar pressure is given with respect to atmospheric pressure, which is always set tozero. Thus, when alveolar pressure exceeds atmospheric pressure, it is positive; when alveolarpressure is below atmospheric pressure it is negative. Alveolar pressure determines whether air will flow into or out of the lungs.

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