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Why to drink water if it is produced during the chemical reactions during respiration?

Why to drink water if it is produced during the chemical reactions during respiration?

The formula for respiration is:

Glucose + Oxygen –> water + Carbon dioxide + Energy (ATP)

Asked a group of students of class VII, KV AFS Bidar


Water is just a product during respiration. The amount of water obtained during respiration is not sufficient to carry out all the functions. Water has a multitude of functions in human body. See the picture below.


About 78% of human body is water.

The water:

  • Transports nutrients and oxygen into cells
  • Moisturizes the air in lungs
  • Helps with metabolism
  • Protects our vital organ
  • Helps our organs to absorb nutrients better
  • Regulates body temperature
  • Detoxifies
  • Protects and moisturizes our joints

For all the above functions we require more water than produced as a byproduct of respiration.

More details on the role of water in human body can be read from:


Physics of Fever !

Meera Madhu asks:

“when we have fever we feel cold but sb who touches us feel our body temp why???????”


Human body always tries to maintain a constant temperature. When we have fever, the body temperature will be more than normal which makes us feel that the surrounding is cold. When some body touches us, he feels that our body is hotter because his body is at a lower temperature than ours.

We feel chilled in cold climate not because our body temperature is low, but because the atmospheric temperature is low.

Can a human body made transparent?

Arvind asks:

“can a human body made transparent?”


Human body is transparent to radiations of higher frequencies like X rays and gamma rays.

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