NEET PG DENTAL EXAM

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: -The first phase is called inspiration, or inhaling. When the lungs inhale, the diaphragm contracts and pulls downward. At the same time, the muscles between the ribs contract and pull upward. This increases the size of the thoracic cavity and decreases the pressure inside.

Detailed explanation-3: -Final answer: During exhalation, the ribs move downwards.

Detailed explanation-4: -During exhalation, ribs move down and inwards, while diaphragm moves upwards and relaxes. This reduces the size of the chest cavity and the air is expelled out of the lungs through a process called exhalation.