In our surrounding lot of gas are found so that how can we take only oxygen
Answers
➡️Basically when air fills our alveoli, by the process of diffusion, only oxygen in the air is taken into the blood stream while the other gases along with the waste CO2 is exhaled.
➡️So you do breathe in nitrogen, but it is exhaled as it is by the body.
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For an answer to your question, you need to know about breathing. Breathing is the processes of delivering oxygen to where it is needed in the body and remove carbon dioxide.
By volume, air contains 78.09% nitrogen, 20.95% oxygen, 0.93% argon, 0.039% carbon dioxide, and small amounts of other gases. Air also contains a variable amount of water vapor, on average around 1% at sea level, and 0.4% over the entire atmosphere.
When you breathe in - or inhale, your lungs expand, air is sucked in through your nose or mouth. The air travels down your windpipe and into your lungs. After passing through your bronchial tubes, the air finally reaches and enters the alveoli (air sacs).
Through the very thin walls of the alveoli, oxygen from the air passes to the surrounding capillaries (blood vessels). A red blood cell protein called hemoglobin helps move oxygen from the air sacs to the blood. A very, very little nitrogen simply dissolves in the blood and into any cell/tissue. This is inert, our bodies have no ability to react chemically with that nitrogen.