Percentage water human body 90? 70? 53?

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SUMMARY

The human body is composed of approximately 60% water, based on the reference man weighing 70 kilograms (154 pounds), which equates to 42 kilograms (92.4 pounds) of water. This percentage varies by demographics; women typically have a lower percentage due to higher adipose tissue, while infants have a higher percentage and elderly individuals have less. Water distribution in the body consists of two-thirds within cells, with the remaining third divided into interstitial fluid (75%) and blood plasma (25%).

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  • Understanding of human physiology and body composition
  • Knowledge of basic biological terms such as adipose tissue and interstitial fluid
  • Familiarity with demographic variations in body composition
  • Basic understanding of fluid distribution in biological systems
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  • Research the impact of age on body water composition
  • Explore the differences in body water percentage between genders
  • Learn about the physiological roles of interstitial fluid and blood plasma
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This discussion is beneficial for health professionals, students of human physiology, fitness trainers, and anyone interested in understanding body composition and hydration levels.

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Hi, every time I hear any website/TV program/person mention the percentage water composition of the human body it varies tremendously. 90,80,85,70,53. What is it? any help appreciated. Thanks
 
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My Human Physiology book says that the 70-kilogram (154 pounds) reference man has 60% of his total body weight in the form of water (42 kg or 92.4 pounds). For women, it's a bit less because women have more adipose tissue (fat). Infants have more and old people have less water.

About two thirds of the water is in the cells, and the remaining third is split between interstitial fluid (75%) and the (blood) plasma (25%).
 
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