THORAX ABDOMEN AND PELVIS

Detailed explanation-1: -When the lungs exhale, the diaphragm relaxes, and the volume of the thoracic cavity decreases, while the pressure within it increases. As a result, the lungs contract and air is forced out.

Detailed explanation-2: -In exhalation, the diaphragm moves upward and the chest wall muscles relax, causing the chest cavity to get smaller and push air out of respiratory system through the nose or mouth.

Detailed explanation-3: -This expansion creates a vacuum that draws in air from outside the body, this is called inhalation. When the diaphragm relaxes, it pushes upward, which causes the chest cavity to contract and expels air from within the body, this is referred to as exhalation.