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changes that happen during exhalation :-
♣ diaphragm relaxes and moves upward, decresing the volume of chest cavity.
♣ due to diaphragm lungs contract.
♣ pectoralis and intercostal muscles relax.
♣ As such movements takes place they reduce the pressure of air inside the lungs. Due to high pressure inside the lungs and low pressure outside the body air from the lungs moves out of the body called exhalation
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