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Assertion (A): The process of inspiration relies on the establishment of negative pressure within the lungs in relation to atmospheric pressure.
Reason (R): Air movement into and out of the lungs is facilitated by the generation of a pressure gradient between the lungs and the surrounding atmosphere.
If both Assertion (A) and Reason (R) are true, and Reason (R) provides a correct explanation for Assertion (A).
If both Assertion (A) and Reason (R) are true, but Reason (R) does not provide a correct explanation for Assertion (A).
If Assertion (A) is true, but Reason (R) is false.
If both Assertion (A) and Reason (R) are false.
Answers (1)
Assertion (A) states that inspiration can occur if there is negative pressure in the lungs with respect to atmospheric pressure. This statement is true. During inspiration, the diaphragm and intercostal muscles contract, expanding the thoracic cavity and creating negative pressure within the lungs. This negative pressure allows air to flow into the lungs.
Reason (R) supports Assertion (A) by explaining that the movement of air into and out of the lungs is facilitated by creating a pressure gradient between the lungs and the atmosphere. This pressure gradient is established by the contraction of the respiratory muscles during inspiration and the subsequent expansion of the thoracic cavity. As a result, air moves from an area of higher pressure (atmosphere) to an area of lower pressure (lungs) to equalize the pressure.
Since both Assertion (A) and Reason (R) are true, and Reason (R) correctly explains Assertion (A), the correct answer is (A). Hence, the correct answer is option 1.
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