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When we inhale or breathe in, we actually take in air which is rich in oxygen. However, we do not take air which has only oxygen. Along with oxygen their are other types of gases like carbondioxide, nitrogen, etc. The air goes into our lungs through the windpipe where diffusion occurs. During diffusion, air is exchanged and then reaches our heart. Then this air goes through the blood vessels and reaches our cells. After this process the air is exhaled or breathed out. The air that we exhale is warmer because of more amount of carbondioxide present in them. Thus, the composition of air that we breathe in or inhale is different from that we breathe out or exhale.
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