What is respiration in human being?

I am molecule of oxygen. I wad once a part of the air, but now a young, two-year-old bo, Hairs, has inhaled the air. Now i am travelling in his body.

You know all living thing require oxygen to live. If your brain stop receiving oxygen you would slowly asphyxiation and die. Your lungs breath in air and after removing oxygen, they discard other gases likr carbon dioxide when you breath out. This process know as "respiration".

Now I'll tell you how I reached the lungs. When hair inhaled the air, I was pulled in. Inside, I saw two tube in his throat. Food goes down the tube at the back and the air he breathes goes down the tube in the front. This tube in the front is called the windpipe or Trachea.

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