Question

Forced expiration resulting in exhalation of CO, rich air to the atmosphere involves
O Relaxation of diaphragm
O Contraction of diaphragm
O Contraction of external intercostal muscles
O Relaxation of abdominal muscles
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Answer 1

Answer:

Pulmonary ventilation is the act of breathing, which can be described as the movement of air into and out of the lungs. The major mechanisms that drive pulmonary ventilation are atmospheric pressure (Patm); the air pressure within the alveoli, called alveolar pressure (Palv); and the pressure within the pleural cavity, called intrapleural pressure (Pip).