THORAX ABDOMEN AND PELVIS

Detailed explanation-1: -Expiration (exhalation) is the process of letting air out of the lungs during the breathing cycle. During expiration, the relaxation of the diaphragm and elastic recoil of tissue decreases the thoracic volume and increases the intraalveolar pressure. Expiration pushes air out of the lungs.

Detailed explanation-2: -Excessive breathing creates a low level of carbon dioxide in your blood. This causes many of the symptoms of hyperventilation. You may hyperventilate from an emotional cause such as during a panic attack.