Assertion :The abdominal muscles are primarily involved in generating pressure gradient between the lungs and the atmosphere. Reason: The strength of inspiration and expiration can be increased by additional muscles in diaphragm and intercostal muscles.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Both Assertion and Reason are incorrect

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Solution

The correct option is D Both Assertion and Reason are incorrect
The diaphragm and a specialised set of muscles-external and internal intercostals between the ribs, help in generating pressure gradient. Besides this we can increase the strength of inspiration and expiration with the help of additional muscles in the abdomen.

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