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NEETZoologyBreathing and Exchange of Gases

Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A): The diffusion of CO ₂ from tissues into the systemic blood is independent of the cellular utilisation of O ₂ . Reason (R): Catabolic reactions in the cells continuously consume O ₂ and release CO ₂ , creating a partial pressure gradient between tissues and systemic capillaries. In the light of the

Options

  1. ABoth Assertion and Reason are correct and Reason is the correct explanation of Assertion.
  2. BBoth Assertion and Reason are correct but Reason is not the correct explanation of Assertion.
  3. CAssertion is correct but Reason is not correct.
  4. DAssertion is not correct but Reason is correct.

Correct answer

D. Assertion is not correct but Reason is correct.

Step-by-step solution

Assertion (A) is not correct because the diffusion of CO ₂ from tissues into the blood is directly driven by the cellular utilisation of O ₂ . Reason (R) is correct. During cellular respiration, catabolic reactions continuously consume O ₂ and release CO ₂ . This metabolic activity increases the partial pressure of CO ₂ ( p CO ₂ ) in the tissues compared to the systemic capillaries, creating the concentration gradient necessary for the passive diffusion of CO ₂ into the blood. Thus, Assertion is not correct but Rea

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