NextMockSearch exams, e.g. SSC CGL, UPPSC, Lekhpal
Railways PYQCBT 1 2016

RRB NTPC · Question 96

Human blood platelets release ______ which helps in clotting of blood. A. Prothrombin B. Fibrin C. Fructose D. Sucrose

  1. A

  2. D

  3. B

  4. C

Show answer & explanation

Answer: (A) A

Explanation

When blood vessels are injured, platelets release factors (thromboplastin) that help convert prothrombin into thrombin, which turns fibrinogen into a fibrin mesh that forms the clot. The official key marks prothrombin.