During expiration,the diaphragm becomes

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(C) Expiration is the process by which $CO_{2}$ is expelled from the lungs.During this process,the muscle fibres of the diaphragm relax,causing it to

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Dome-shaped

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(C) Expiration is the process by which $CO_{2}$ is expelled from the lungs.During this process,the muscle fibres of the diaphragm relax,causing it to return to its original dome-shaped structure.This relaxation decreases the volume of the thoracic cavity,which increases the pressure inside the lungs,forcing air out.

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