Anatomy and Physiology II Practice Test 2026 - Free Anatomy Practice Questions and Study Guide

Vitamin K is classified as a fat-soluble vitamin, which means it dissolves in fats and oils and is generally stored in the body's fatty tissues and liver. Fat-soluble vitamins, including Vitamins A, D, E, and K, have specific roles in the body that require their absorption alongside dietary fats.

Vitamin K plays a critical role in blood coagulation (clotting) and bone metabolism. It is necessary for the synthesis of certain proteins that mediate these functions and is essential for preventing excessive bleeding. As a fat-soluble vitamin, it is absorbed in the intestines along with fat, making it important to consume it with dietary fats to enhance its absorption.

In contrast, water-soluble vitamins, such as the B vitamins and Vitamin C, do not require dietary fat for absorption and are not stored in significant amounts within the body. Minerals are inorganic elements essential for various bodily functions and are not classified as vitamins. Therefore, classifying Vitamin K as a fat-soluble vitamin is accurate because of its solubility and physiological roles.