What happens when we exhale during normal breathing?

Correct option is B

The correct answer is (B)  A residual amount of air remains in the lungs

• The process of breathing out carbon dioxide is called expiration.
• Expiration occurs when the air pressure outside the body is higher than inside.

During this process:

• External intercostal muscles relax, and internal intercostal muscles contract.
• The thoracic cavity reduces in size, causing the diaphragm to relax and compress the lungs.
• A small amount of air, called residual volume, remains in the lungs after exhalation.