Why do we breathe  air and why do we drink water.

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jeew-m eNotes educator| Certified Educator

Water is a major need for all human being. It is a must for them to survive. Man need water to various actions inside the body. Usually a man need to drink about 2.4 liters of water everyday.

  • Drinking water will be useful in following things in our body.
  • Water cushions and lubricates joints
  • nourishes and protects the brain, spinal cord and other tissues
  • keeps the body's temperature normal
  • Helps remove waste through perspiration, bowel movements and urination

However drinking lack of water of too much water not good for health.


Breathing air is also very much important to survive for human being. Not as drinking water breathing happens automatically. We even don't notice that we are breathing. By breathing air we take oxygen to our body.

When you inhale, a large muscle called the diaphragm flexes downward to help draw air into your lungs. Your lungs are one of the largest organs in your body. They work together with the rest of your respiratory system to keep your body's cells supplied with necessary oxygen.

 Your cells need oxygen to convert the nutrients you eat into energy for your body. In the process of making that energy, some waste products are produced. One of the main waste products is a gas called carbon dioxide.

Your body needs to get rid of carbon dioxide, so what does it do? It breathes it out!

So without breathing you won't be able to read this answer. It is that important. 


megamind-616 eNotes educator| Certified Educator

Air is made of approximately 78% nitrogen, 21% oxygen, and 1% argon. The rest of air consists of trace gases such as carbon dioxide, water vapor, and methane. Humans, as well as other animals, use the oxygen within air during cellular respiration. Cellular respiration is the process by which a sugar called glucose and oxygen are used to produce carbon dioxide, water, and ATP. ATP (adenosine triphosphate) serves as a vital energy resource in our bodies.

Up to 70% of the human body is made of water. Water serves many purposes.  Sweat is mostly water. The evaporation of sweat from our bodies helps to cool us when we are warm. Water helps to transport materials between cells. Water helps to move food through our digestive systems and urinary tracts. Likewise, it is a vehicle for removing toxins from our bodies. Last, but not least, water helps to cushion and lubricate joints.

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