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