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Assertion: Surface tension is decreased, preventing the lungs from contracting during exhale.
Reason: Surface tension in the lungs is decreased by the pleural fluid that exists between the two layers of the pleura.
Both Reason and Assertion are true, and the Assertion is the correct explanation of the Reason.
Both Reason and Assertion are true, but the Assertion is not the correct explanation of the Reason.
Reason is true, but the Assertion is false.
Reason is false, but the Assertion is true.
Answers (1)
In order to keep the lungs from collapsing during exhale, the pleural fluid that lies between the two layers of the pleura serves to lower the surface tension of the lungs. Due to hydrogen bonding, water molecules are drawn to one another, creating surface tension. This surface tension is broken by the pleural fluid, which permits the lungs to expand during inhalation and prevents them from contracting during expiration. As a result, the Assertion adequately supports the Reason, and both the Reason and Assertion are true.
Hence, the correct answer is option 1.
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