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Importance of water

Importance of water in human body

Water can be defined as a clear, odorless, tasteless, and colorless liquid that is very crucial for most animal and plant life and the most commonly used as compared to other solvents. It is well known that, water is the most abundant substance and very crucial in the human body. Human mass consists of about three quarters of water and this is the major constituent in all cells within the body. Water plays critical roles in the human body, for instance provision of a medium in which blood cells bath, regulation of body temperature, improving digestion, carrying the absorbed nutrients throughout the body, and it is used in the elimination of waste and toxic substances from the body (Claybourne, 2006).

Blood in the human body consist of 95 percent water. Water provides a medium in which blood cells bath such that it allows for exchange of materials like nutrients in and out of the cells normally. The average normal body temperature for human body is 37 degrees Celsius. Water ensures that, during the normal conditions of the body, the temperature does not exceed this limit by more that 1 degree Celsius. Through sweating, human body can lose excess heat and this account for 22 percent of the ways the body loses excess heat. Water has a characteristic latent heat of vaporization such that when it gets at the surface of the skin as sweat, it will absorb the excess heat and evaporate as it attains about 100 degrees Celsius (Claybourne, 2006).

Water is very vital during the process of digestion in human beings. The ingested food needs to be softened so that it can be acted on by enzymes. For example in the mouth, that saliva contains water, mucus and the ptyalin enzyme. This enzyme can work on the cooked starch arriving at the mouth after it has been moistened. Water provides for a medium in which nutrients are dissolved after digestion has taken place. Nutrients in solution form get absorbed into the blood circulatory system from where they are assimilated into various body cells and tissues for metabolism. After metabolism, waste products which result need to be eliminated. Waste products dissolved in water get their ways out of the body cells and tissues into blood. These waste products are carried to active excretion cites for example skin, lungs, and kidneys (Rosdahl & Kowalski, 2008). 

Dehydration can be defined as the process by which human body, body part or even an organ loses water due to fluid deprivation or illness. Dehydration is very common in children, infants, and seniors. Young children and infants lose more body water during vomiting or diarrhea. Seniors can also lose water due to vomiting and diarrhea but not as much as in the case of infants and young children. One can realize that he or she is undergoing dehydration when the mouth becomes dry and sticky; having sunken eyes which may not produce tears; feel lethargic, sleepy and tired; the urine out becomes low and its usually dark yellow in color; and experience muscle weakness, headache or dizziness. It is very important to drink a lot of water daily, for instance 8 glasses so that to ensure normal percentage of water in the body. Infants should also be given oral rehydration salts appropriately (Organization, 1976). 


Claybourne, A., (2006). The Human Body. London: Evans.

Organization, W., (1976). Treatment and Prevention of Dehydration in Diarrhoeal Diseases.   Geneva: World Health Organization.

Rosdahl, C., & Kowalski, M. (2008). Textbook of Basic Nursing. Hagerstwon: Lippincott Williams & Wilkins.

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