Question

1. Breathing involves two stages - inspiration during which atmospheric air is drawn in and expiration by which the alveolar air is released out. 2. The movement of air into and out of the lungs is independent of the pressure gradient between the lungs and the atmosphere. Regarding 1 and 2 :

Answer 1

1) true. Breathing involves inspiration and expiration.

2) False. Process of breathing is dependent on relative pressure difference between lungs and atmosphere.