Certified Dietary Manager (CDM) Practice Exam

Which vitamin is primarily involved in blood clotting?

1. Vitamin A

2. Vitamin C

3. Vitamin K

4. Vitamin D

The correct answer is: Vitamin K

Vitamin K plays a crucial role in the blood clotting process, making it the correct choice for identifying the vitamin primarily involved in this physiological function. This vitamin is essential for the synthesis of certain proteins known as clotting factors, which are necessary for proper blood coagulability. Without adequate levels of Vitamin K, the body would not be able to effectively stop bleeding, which could lead to excessive blood loss from injuries. In contrast, Vitamin A is primarily involved in vision, immune function, and skin health, playing no direct role in blood coagulation. Vitamin C is more focused on collagen formation, antioxidant protection, and improving iron absorption. Vitamin D is vital for calcium absorption and bone health but does not influence the blood clotting cascade. Understanding the specific functions of each vitamin helps clarify the unique significance of Vitamin K in relation to blood clotting.