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Have you ever wondered how much of your body is water? The percentage of water varies according to your age and gender. Here’s a look at how much water is inside you.
By weight, the average human adult male is approximately60% water and the average adult female is approximately 50%. There can be considerable variation in body water percentage based on a number of factors like age, health, weight, and sex. In a large study of adults of all ages and both sexes, the adult human body averaged ~65% water. However, this varied substantially by age, sex, and adiposity.
The figure for water fraction by weight in this sample was found to be 58 ±8% water for males and 48 ±6% for females. The body water constitutes as much as 73% of the body weight of a newborn infant, whereas some obese people are as little as 45% water by weight. This is due to how fat tissue does not retain water as well as lean tissue. These statistical averages will vary with factors such as type of population, age of people sampled, number of people sampled, and methodology. So there is not, and cannot be, a figure that is exactly the same for all people, for this or any other physiological measure.
Most of animal body water is contained in various body fluids. These include intracellular fluid; extracellular fluid; plasma; interstitial fluid; and transcellular fluid. Water is also contained inside organs, in gastrointestinal, cerebrospinal, peritoneal, and ocular fluids. Adipose tissue contains about 10% of water, while muscle tissue contains about 75%.
In Netter’s Atlas of Human Physiology, body water is broken down into the following compartments: In Netter’s Atlas of Human Physiology, body water is broken down into the following compartments:
• Intracellular fluid (2/3 of body water) is fluid contained within cells. In a 72-kg body containing 40 liters of fluid, about 25 liters is intracellular, which amounts to 62.5%. Jackson’s texts states 70% of body fluid is intracellular.
• Extracellular fluid (1/3 of body water) is fluid contained in areas outside of cells. For a 40-litre body, about 15 liters is extracellular, which amounts to 37.5%.
• Plasma (1/5 of extracellular fluid). Of this 15 liters of extracellular fluid, plasma volume averages 3 liters, or 20%.
• Interstitial fluid (4/5 of extracellular fluid)
• Transcellular fluid (a.k.a. “third space,” normally ignored in calculations) contained inside organs, such as the gastrointestinal, cerebrospinal, peritoneal, and ocular fluids.
• The amount of water in the human body ranges from 50-75%.
• The average adult human body is 50-65% water.Most of the body’s water is in the intracellular fluid (2/3 of the body’s water). The other third is in the extracellular fluid (1/3 of the water).The amount of water varies, depending on the organ. Much of the water is in blood plasma (20% of the body’s total). According to a study performed by H.H. Mitchell, published in the Journal of Biological Chemistry, the amount of water in the human heart and brain is 73%, the lungs are 83%, muscles and kidneys are 79%, the skin is 64%, and the bones are around 31%.
For example, a 70-kg man is made up of about 42L of total water.
- 28 liters is intracellular water
- 14L is found in extracellular fluid of which
- 3L is blood plasma,
- 1L is the transcellular fluid (cerebrospinal fluid, ocular, pleural, peritoneal and synovial fluids).
- 10L is the interstitial fluid (including lymph), which is an aqueous medium surrounding cells.
so majority(66%) of the body water is inside the cells.so we are’t in the form of water.
- Water is the primary building block of cells.
- It acts as an insulator, regulating internal body temperature. This is partly because water has a high specific heat, plus the body uses perspiration and respiration to regulate temperature.
- Water is needed to metabolize proteins and carbohydrates used as food. It is the primary component of saliva, used to digest carbohydrates and aid in swallowing food.
- The compound lubricates joints.
- Water insulates the brain, spinal cord, organs, and fetus. It acts as a shock absorber.
- Water is used to flush waste and toxins from the body via urine.
- Water is the principal solvent in the body. It dissolves minerals, soluble vitamins, and certain nutrients.
- Water carries oxygen and nutrients to cells.
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