Final answer:
Blood coagulation Factor II, or prothrombin, plays a crucial role in the clotting pathway of the blood. It is produced by the liver and its activation leads to the formation of thrombin and subsequent clot formation. Vitamin K and calcium are essential for the production of prothrombin.
Step-by-step explanation:
Blood coagulation Factor II, also known as prothrombin, is part of the clotting pathway in the blood. It is converted to thrombin during the activation of the common pathway. Prothrombin is produced by the liver and is dependent on vitamin K and calcium for its production. Activation of one clotting factor stimulates the production of other clotting factors until a fibrin clot is formed.