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From other websitesContent disclaimerContent on this website is provided for information purposes only. Information about a therapy, service, product or treatment does not in any way endorse or support such therapy, service, product or treatment and is not intended to replace advice from your doctor or other registered health professional. The information and materials contained on this website are not intended to constitute a comprehensive guide concerning all aspects of the therapy, product or treatment described on the website. All users are urged to always seek advice from a registered health care professional for diagnosis and answers to their medical questions and to ascertain whether the particular therapy, service, product or treatment described on the website is suitable in their circumstances. The State of Victoria and the Department of Health shall not bear any liability for reliance by any user on the materials contained on this website. Learning Objectives Of all the nutrients, water is the most critical as its absence proves lethal within a few days. Water's importance in the human body can be loosely categorized into four basic functions: transportation vehicle, medium for chemical reactions, lubricant/shock absorber, and temperature regulator. Water As a Transportation VehicleWater is called the “universal solvent” because more substances dissolve in it than any other fluid. The dissolved substances (solutes) include many materials including ions, sugars, amino acids, vitamins, and minerals. Molecules dissolve in water because of the hydrogen and oxygen molecules ability to loosely bond with other molecules. Molecules of water (H2O) surround substances, suspending them in a sea of water molecules. The solvent action of water allows for substances to be more readily transported. Blood, the primary transport fluid in the body, is mostly made up of water. Dissolved substances in blood include proteins, lipoproteins, glucose, electrolytes, and metabolic waste products, such as carbon dioxide and urea, all of which are either dissolved in the watery surrounding of blood to be transported to cells to support basic functions or are removed from cells to prevent waste build-up and toxicity. Water As a Medium for Chemical ReactionsWater is required for even the most basic chemical reactions. Previously, you learned that enzymes are proteins that conduct specific chemical reactions. Enzmyes conduct these reactions in a medium (environment); in the human body the medium is water. Water is an ideal medium for chemical reactions as it can store a large amount of heat, is electrically neutral, and has a pH of 7.0, meaning it is not acidic or basic. Additionally, water is involved in many enzymatic reactions as an agent to break bonds or, by its removal from a molecule, to form bonds. Water As a Lubricant and Shock AbsorberWater is the main component of the fluids that protect and lubricate tissues. For example:
Water As a Temperature RegulatorWater plays an important role in thermoregulation (temperature regulation). Human life is supported within a narrow range of temperature, with the temperature set point of the body being 98.6°F (37°C). Too low or too high of a temperature causes enzymes to stop functioning and metabolism is halted. At 82.4°F (28°C) muscle failure occurs and hypothermia sets in. At the opposite extreme of 111.2°F (44°C) the central nervous system fails and death results. Water is good at storing heat, an attribute referred to as heat capacity. Water has a high heat capacity which means that it takes alot of external energy to raise water's temperature. This ability helps maintain the temperature set point of the body despite changes in the surrounding environment (e.g., high temperatures outside). There are several mechanisms in place that move body water from place to place as a method to distribute heat in the body and equalize body temperature. The hypothalamus in the brain is the thermoregulatory center (Figure \(\PageIndex{1}\)). The hypothalamus contains special protein sensors that detect blood temperature. The skin also contains temperature sensors that respond quickly to changes in immediate surroundings. When the surrounding temperature is cold, sensors in the skin send a signal to the hypothalamus, which then sends a signal to smooth muscle tissue surrounding blood vessels causing them to constrict and reduce blood flow. This reduces heat lost to the environment. The hypothalamus also sends signals to muscles to erect hairs and shiver and to endocrine glands like the thyroid to secrete hormones capable of ramping up metabolism. These actions increase heat conservation and stimulate its production in the body in response to cooling temperatures. Figure \(\PageIndex{1}\): Thermoregulation is the ability of an organism to maintain body temperature despite changing environmental temperatures. (CC BY 4.0; by Lauren Groth)When body temperature rises (for example, during exercise), the hypothalamus detects an increase in blood temperature. In response, the hypothalamus sends a signal to the smooth muscle of blood vessels causing them to dilate so that more blood flows to the body’s periphery. Once on the skin, extra heat exits the body via perspiration (sweat), which is 98 to 99 percent water. Water on the skin’s surface evaporates, a process that uses energy and results in the loss of heat, thereby cooling the body. Perspiration is a process that intertwines temperature regulation with fluid and electrolyte balance. Water and electrolytes lost in sweat need to be replenished in order to maintain fluid and electrolyte balance. Key Takeaways
What are the 6 functions of water?Here are just a few examples of the ways water works in your body:. Regulates body temperature.. Moistens tissues in the eyes, nose and mouth.. Protects body organs and tissues.. Carries nutrients and oxygen to cells.. Lubricates joints.. Lessens burden on the kidneys and liver by flushing out waste products.. What are the 4 main functions of water in the body?Water's importance in the human body can be loosely categorized into four basic functions: transportation vehicle, medium for chemical reactions, lubricant/shock absorber, and temperature regulator.
What is the most important function of water in the body?Your body uses water in all its cells, organs, and tissues to help regulate temperature and maintain other bodily functions. Because your body loses water through breathing, sweating, and digestion, it's important to rehydrate by drinking fluids and eating foods that contain water.
What are 5 of the 10 things water does for your body?Read on to learn more ways water can help improve your well-being.. It helps create saliva. ... . It regulates your body temperature. ... . It protects your tissues, spinal cord, and joints. ... . It helps excrete waste through perspiration, urination, and defecation. ... . It helps maximize physical performance. ... . It helps prevent constipation.. |