Which of the following is NOT listed as a function of water in the animal body?

• A. Eliminate waste products of digestion and metabolism
• B. Regulate blood osmotic pressure
• C. Produce milk and saliva
• D. Build new muscles

Answer: (D)

Water supports several key bodily functions because it is the medium in which many processes occur. It helps flush out waste through urine and feces, maintains the osmotic balance of blood and cells, and is a major component of secretions like saliva and milk. Building new muscles, however, is not a direct function of water. Muscle growth comes from protein synthesis, adequate energy, and training, with hydration aiding these processes by supporting transport and circulation, not by creating muscle tissue itself. So the option describing building new muscles is not a listed function of water.