In normal breathing, inspiration is an active process as it is brought about by the contraction
of diaphragm and external intercostal muscles, while expiration is a passive process as it simply involves relaxation of inspiratory muscles.
In normal breathing, inspiration is an active process as it is brought about by the contraction
of diaphragm and external intercostal muscles, while expiration is a passive process as it simply involves relaxation of inspiratory muscles.