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Assertion (A) : Blood coagulates in uninjured blood vessels. R
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Assertion (A) : Blood coagulates in uninjured blood vessels.
Reason (R) : Uninjured blood vessels release an anticoagulant heparin.

A
If both Assertion and Reason are true and Reason is the correct explanation of Assertion

B
If both Assertion and Reason are true but Reason is not the correct explanation of Assertion.

C
If Assertion is true but Reason is false.

D
If both Assertion and Reason are false.

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Views: 5,905 students

Updated on: Feb 27, 2023

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Book:

NEET Question Bank i Biology for AIIMS (Disha)

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Assertion (A) : Blood coagulates in uninjured blood vessels.
Reason (R) : Uninjured blood vessels release an anticoagulant heparin.
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Text SolutionText solutionverified iconVerified

When an injury is caused to a blood vessel, bleeding starts which is stopped by blood clotting. At the site of injury blood platelets release platelet factor - 3 and injured tissues release thromboplastin. The two combine to form prothrombinase enzyme which converts prothrombin to thrombin. The latter stimulates formation of fibrin thread or clot. Blood contains an anticoagulant heparin which prevents blood clotting in uninjured vessels. 
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  1. If both Assertion and Reason are true and Reason is the correct explanation of Assertion
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  3. If Assertion is true but Reason is false.
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  4. If both Assertion and Reason are false.
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Question Text
Assertion (A) : Blood coagulates in uninjured blood vessels.
Reason (R) : Uninjured blood vessels release an anticoagulant heparin.
Updated OnFeb 27, 2023
TopicBody Fluids and Circulation
SubjectBiology
ClassClass 11
Answer TypeText solution:1 Video solution: 1
Upvotes128
Avg. Video Duration5 min