Question

Increased intrapulmonary pressure causes

• A. expiration
• B. inspiration
• C. air to move out of the lungs
• D. air to move in to the lungs

Answer 1

Answer: (A), (C)

The correct options are
A expiration
C air to move out of the lungs

Expiration or exhalation refers to the movement of air out of the lungs. Following inspiration and exchange of gases, the diaphragm domes up, decreasing thoracic volume and increasing intrapulmonary pressure, which is the pressure in the lungs. This increase in pressure forces air out of the lungs and back to the atmosphere.