Which of the following are involved in increasing the volum…

Biology Breathing and Exchange of Gases Skill Builder Single Correct MCQ

Published by: CGP EDU Academic Team

Published on: August 21, 2026

Which of the following are involved in increasing the volume of the thoracic cavity during inspiration?

Contraction of the diaphragm and ,

Relaxation of the diaphragm , ,

Contraction of external intercostal muscles only and and (E) and (E)

Relaxation of internal intercostal muscles (E) Contraction of internal intercostal muscles Options:

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The correct answer is:

During inspiration, the diaphragm contracts and moves downward while the external intercostal muscles contract to lift the ribs upwards and outwards, increasing the volume of thoracic cavity.

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