Q. Which of the following is necessary for Blood clotting in humans?
Answer: Vitamin K
Notes: Vitamin K is a group of structurally similar, fat-soluble vitamins the human body requires for complete synthesis of certain proteins that are prerequisites for blood coagulation. It is noteworthy for the synthesis of Prothrombin (coagulation factor II) that forms thrombin in the clotting process. Without vitamin K, blood uncontrolled bleeding occurs.

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