Q

Human blood platelets release _____ which helps in blood clotting.

RRB NTPC (Stage-I) 27/04/2016 (Shift-III) 2016
✓ Answer: A Prothrombin
The source key gives prothrombin. The wording is inaccurate: prothrombin is primarily made in the liver and circulates in plasma; platelets provide surfaces and release substances that promote clotting.
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