MCQ IN MEDICINE

Detailed explanation-1: -Upon inhalation, the diaphragm contracts and flattens and the chest cavity enlarges. This contraction creates a vacuum, which pulls air into the lungs. Upon exhalation, the diaphragm relaxes and returns to its domelike shape, and air is forced out of the lungs.

Detailed explanation-2: -This dome-shaped muscle that stretches across your torso is called the diaphragm (die-uh-fram) and when your diaphragm is relaxed, it resembles an oblong umbrella top that is squeezed underneath your ribs and creates the base of your chest cavity.

Detailed explanation-3: -Exhalation is passive (no active muscle activity) and is caused by the natural elastic recoil of the lung tissue and is accompanied by the relaxation of all breathing muscles.