PSI Barbering Practice Exam 2025 - Free Barbering Practice Questions and Study Guide

Body tissues are primarily composed of water, which plays a crucial role in maintaining their structure and function. Water constitutes a significant portion of cells and serves as a medium for biochemical reactions, facilitating the transport of nutrients, waste products, and other essential substances. The presence of water is vital for the proper functioning of tissues, as it helps maintain cellular integrity and regulates temperature.

In addition, while proteins, adipose (fat), and minerals are important components of body tissues, they are not the primary substance. Proteins are essential for many structural and functional roles in tissues, including muscle fibers, enzymes, and antibodies. Adipose tissue mainly serves as a storage for energy in the form of fat, and while minerals are crucial for various physiological processes, they are found in smaller quantities compared to water. Overall, water's abundance and multifunctional role in maintaining tissue health make it the primary component of body tissues.