Question

Breathing is a physical process which involves the movement of:

• A. Ribs
• B. Nasal cavity
• C. Trachea
• D. Diaphragm

Answer 1

Answer: (A), (D)

Diaphragm

$\bullet$ Breathing involves the movement of both diaphragm and ribcage.
$\bullet$ During inhalation, ribs move up and outwards and the diaphragm moves down. This movement increases the space in the chest cavity and air enters into the lungs.
$\bullet$ During exhalation the ribs move down and inwards, while the diaphragm rises up. This reduces the size of the chest cavity and air is pushed out of the lungs.