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Assertion (A) : Internal respiration means the exchange of gases in cell through extracellular fluid.

Reason (R) : Pulmonary circulation means systemic circulation.
In the context of above statements, which one of the following is correct ?

  • A.Both (A) and (R) are true and (R) is the correct explanation of (A).
  • B.Both (A) and (R) are true but (R) is not the correct explanation of (A).
  • C.(A) is true, but (R) is false.
  • D.(A) is false, but (R) is true.

Answer: C

The assertion is true and the reason is false, option C. Internal (tissue) respiration is the exchange of gases between the blood and the cells through the tissue fluid. The reason is false because pulmonary circulation, between the heart and lungs, is not the same as systemic circulation, which carries blood from the heart to the rest of the body.

Options A and B accept the reason as true, and D rejects the assertion.

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