Exhalation is the passive process where the lungs do not require any energy expenditure. The lungs are deflated during exhalation and the diaphragm and muscles relax down.
Lungs are the part of the respiratory system that mediates the exchange if air from the environment and inside the body. There exists a pair of lungs in humans that is covered with the small air sacs called alveoli. These alveoli increase the surface area of the lungs.
Diaphragm is the muscle that prevents the collapse of lungs from the bottom. These muscles also aid in the exhalation and inhalation process. The diaphragm is a dome-shaped muscle and its movement in involuntary.
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