Water contents of vital parts of human body normally are:
Brain 74%
heart 77%
lungs 86%
kidney 83%
liver 85%.
Skin 71%
Muscles 75%
Blood is 83%
Saliva 95%
body fat 25%.
Even those parts of the body which seem dry contain water: bones 22%, teeth 10%.
So, you can see that water is very essential and important to us because it sustains all forms of life. It is key to all forms of life and has fundamental importance for all living organism.
Water is also main compound of human body as about 72% of fat free mass of human body is comprised of water by weight.
Water contents in a body may vary with age and sex and also from person to person. Normally Water contents in body of infants are
77%, adults 65% and gradually drop to 50% for older persons. However, Men have slightly higher percentage (60 to 65) of water than
women (50% to 60%) of body weight, because women have more body fat then men. Fat men also have less water (as a percentage)
than thin men.
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