Anatomy and Physiology II Practice Test

Which of the following is a fat-soluble vitamin?

1. Vitamin C

2. Vitamin K

3. Vitamin B12

4. Vitamin B6

The correct answer is: Vitamin K

Vitamin K is classified as a fat-soluble vitamin, which means it is dissolved in fats and oils and stored in the body's fatty tissues and liver. This characteristic differentiates it from water-soluble vitamins, which do not get stored in the body to the same extent and are excreted more readily in urine. Fat-soluble vitamins, such as vitamins A, D, E, and K, play various essential roles in bodily functions. For example, vitamin K is crucial for blood clotting and bone health, as it is necessary for the synthesis of several proteins involved in these processes. In contrast, the other vitamins listed are water-soluble. Vitamin C is an antioxidant that supports immune function and collagen synthesis. Vitamins B12 and B6 are important for energy metabolism and neurological function. Each of these vitamins has its own unique roles and is not stored in fat, highlighting the distinct differences between fat-soluble and water-soluble vitamins.