Question

Short / long answer type questions.
Briefly describe how the atmospheric air is drawn into lungs.

Answer 1

Atmospheric air is drawn into lungs by the process of inspiration. During inspiration, the inspiratory muscles contract, the diaphragm descends, and the rib cage rises. The thoracic cavity volume increases, stretching the lungs, and the intrapulmonary volume increases. This causes the intrapulmonary pressure to drop. Air flows into the lungs until the intrapulmonary pressure equals the atmospheric pressure.