Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A): A blood clot or coagulum is mainly formed of a network of threads called fibrins. Reason (R): The enzyme thrombin converts inactive fibrinogens present in the plasma into fibrins at the site of injury. In the light of the above statements, choose the correct answer from the options given below.

Step-by-step solution

According to NCERT, a blood clot or coagulum is formed mainly of a network of threads called fibrins in which dead and damaged formed elements of blood are trapped. Thus, the Assertion is true. Fibrins are formed by the conversion of inactive fibrinogens present in the plasma by the enzyme thrombin. Thus, the Reason is true. The Reason correctly explains the Assertion because the enzymatic action of thrombin on fibrinogen is the exact biochemical mechanism that produces the fibrin network mentioned in the Assertion