(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 t

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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.