What is the primary function of vitamin K in the body?

What is the primary function of vitamin K in the body?

• A. Essential for blood clotting (coagulation) and contributes to bone metabolism.
• B. Primary energy production.
• C. Immune system development.
• D. Visual function.

Answer: (A)

Vitamin K’s main job is to enable blood clotting. It acts as a helper for the enzyme that adds carboxyl groups to several clotting factors (II, VII, IX, and X) and to proteins C and S. This gamma-carboxylation lets these proteins bind calcium and work on phospholipid surfaces, which is essential for the cascade that forms a stable clot. In addition, vitamin K plays a role in bone metabolism by enabling carboxylation of osteocalcin, which helps incorporate calcium into the bone matrix. So, while it also contributes to bone health, its primary function is supporting blood coagulation. It’s not about energy production, immune system development, or vision.

Vitamin K’s main job is to enable blood clotting. It acts as a helper for the enzyme that adds carboxyl groups to several clotting factors (II, VII, IX, and X) and to proteins C and S. This gamma-carboxylation lets these proteins bind calcium and work on phospholipid surfaces, which is essential for the cascade that forms a stable clot. In addition, vitamin K plays a role in bone metabolism by enabling carboxylation of osteocalcin, which helps incorporate calcium into the bone matrix. So, while it also contributes to bone health, its primary function is supporting blood coagulation. It’s not about energy production, immune system development, or vision.