The total weight of an average human body is made up of 35–40 % tissue and bone and 60–65 % water. Fluid balance ensures that the body stays hydrated; this is important for normal functioning of the body and optimal health. Mitchell, Journal of Biological Chemistry 158, the brain and heart are composed of 73% water, and the lungs are about 83% water. Drinking Water Helps Maintain the Balance of Body Fluids. The sensation becomes stronger as the body’s need for water increases, motivating a person to drink the needed fluids. Distribution of Water in the Body 3. Introduction to Water Metabolism: Of the three factors, water, salts and food, water is the most important. Minute changes in plasma osmolarity are the main factors that trigger these homeostatic mechanisms. Water speeds up the breakdown of food and absorption of nutrients. Drinking water is often overlooked as a necessary part of staying healthy. If we remember that life […] Water is one of the most essential nutrients that the body requires. Water performs several important functions in the body: Water dissolves and transports minerals, vitamins, proteins, and other important substances throughout the body. We call this water total body water, and it is distributed into 3 compartments throughout the body. Your body is composed of about 60% water. When the body needs water, nerve centers deep within the brain are stimulated, resulting in the sensation of thirst. Water Balance. Introduction to Water Metabolism 2. Thirst is one of the most important mechanisms to maintain water balance. Drinking enough fluids is important when exercising. The body and blood are largely made of water, and so we need a lot of fluid to function. The Importance of Fluid Balance and Hydration. The regulation of water balance is very precise, as a loss of 1% of body water is usually compensated within 24h. Functions of Water 5. Up to 60% of the human adult body is water. Water Content in Various Tissues 4. Active transport uses energy to move substances against (up) a concentration gradient or across a partially permeable membrane. Water is of major importance to all living things; in some organisms, up to 90% of their body weight comes from water. Water balance is the concept that the amount of water lost from the body is equal to the amount of water consumed. The movement of water by osmosis is the main reason why it is so important to control the water balance of the body. Maintaining fluid balance is vital for physical and mental performance. Both water intake and water losses are controlled to reach water balance. On the other hand, 70% of an adult body consists of water, and as people gain weight their bodies have more fat and less water. According to H.H. 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