Question

Differentiate between inhalation and exhalation.

Answer 1

• Inhalation:

1. The muscles of the diaphragm contract.
2. The diaphragm goes downward.
3. The ribs move upwards and outwards.
4. The volume of thoracic (chest) cavity increases.
5. Air enters the lungs through the nose.

• Exhalation:

1. The muscles of the diaphragm relax.
2. The diaphragm goes upward.
3. The ribs move downwards.
4. The volume of thoracic (chest) cavity decreases.
5. Air goes out of the lungs through the nose.