Assertion :Blood coagulates in uninjured blood vessels. Reason: Uninjured blood vessels release an anticoagulant heparin.

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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Both Assertion and Reason are incorrect.

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Solution

The correct option is D Both Assertion and Reason are incorrect.
Blood doesn't coagulate in the uninjured vessels. Heparin remains in the normal blood supply. It prevents blood coagulation in the vessels and keeps normal blood flow. Injured blood vessels release thromboplastin and anti-heparin to initiate blood clotting. Therefore, the correct answer is option D.

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Similar questions

Q. Assertion :Blood coagulates in the injured blood vessels. Reason: Uninjured blood vessels release an anticoagulant heparin.

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Assertion (A) Order of the reaction can be zero or fractional.

Reason (R) We cannot determine order from balanced chemical equation.

(a) Both assertion and reason are correct and the reason is correct explanation of assertion
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(c) Assertion is correct, but reason is incorrect
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Reason (R) Order is determined experimentally and molecularity is the sum of the stoichimetric coeffcient of rate determining elementary step.

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