ACSM Certified Exercise Physiologist (EP-C) Practice Exam 2025 - Free Certified Exercise Physiologist Practice Questions and Study Guide

Water-soluble vitamins primarily include the B-complex vitamins and vitamin C. These vitamins are characterized by their solubility in water, which allows them to be easily absorbed into the bloodstream and utilized by the body. They are not stored in significant amounts and must be regularly consumed in the diet.

Vitamin C is well-known for its role in collagen synthesis, antioxidant activity, and immune function, while the B-complex vitamins encompass a group of vitamins that are essential for energy metabolism and red blood cell production, among other physiological functions. Because of their water solubility, excess amounts of these vitamins are typically excreted in urine rather than stored in the body.

In contrast, the other options listed include fat-soluble vitamins (A, D, E, and K), which need dietary fats for absorption and are stored in the body's fatty tissues and liver. Therefore, the recognition that only the B vitamins and vitamin C belong to the water-soluble category confirms the accuracy of the answer.