Which is a function of water in the body?

• A. Provides energy
• B. Stores genetic information
• C. Lubricates joints
• D. Acts as a primary enzyme

Answer: (C)

Water acts as a lubricant in the joints. It helps form the synovial fluid that coats cartilage where bones meet, creating a slippery film that reduces friction and wear as the joints move. This smooths movement and protects joint surfaces.

Water does not provide energy, store genetic information, or function as an enzyme. Energy comes from calories in the diet, genetic information is stored in DNA, and enzymes are proteins or RNA that catalyze reactions—water itself is not an energy source, genetic material, or an enzyme.