Assertion :Inspiration occurs due to muscular relaxation. Reason: During inspiration, the diaphragm and external intercostal muscle contract simultaneously.

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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Assertion is incorrect but Reason is correct

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Solution

The correct option is D Assertion is incorrect but Reason is correct
Inspiration includes inhalation of normal or forced air involving muscular contraction.
This is referred to as an active phase of ventilation since it is initiated by the contraction of the diaphragm and internal intercostal muscles simultaneously. Hence, during inspiration, the diaphragm and external intercostal muscle contract simultaneously.

So, the correct answer is 'Assertion is incorrect but Reason is correct'.

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