Question

Which among the following statements are true?

• A. During inhalation, chest width increases.
• B. During exhalation, chest width decreases.
• C. During exhalation, chest width increases.
• D. During inhalation, chest width decreases.

Answer 1

Answer: (A), (B)

During exhalation, chest width decreases.

$\bullet$ During inhalation, the 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.