how a human being respiration
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During breathing we take air in to our lungs through the nose, and then expel it. The taking in of air rich in oxygen in to the body during breathing is called inhalation and giving out of the air rich in carbon dioxide is called exhalation. Both the process takes place regularly during breathing.
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When you run, after some time don’t you run of breath and your breathing becomes heavy? But why does this happen? Well, this happens because your body at that moment needs more oxygen. In human respiration, we breathe in oxygen and breathe out carbon-dioxide.
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