Home Biology Breathing and Exchange of Gases General Assertion: The movement of air into and out …
Biology Breathing and Exchange of Gases General Reasons & Assertions
Published on: August 21, 2026

Assertion: The movement of air into and out of the lungs is carried out by creating a pressure

gradient between the lungs and the atmosphere.

Reason: The diaphragm and a specialized set of muscles-external and internal intercostals between the ribs, help in generation of such gradients.

A
Assertion and reason both are true and the reason is correct explanation of assertion.
B
Assertion and reason both are true but reason is not correct explanation of assertion.
C
Assertion is true but reason is wrong.
D
Assertion and reason both are wrong.

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