respiration of human body

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respiration of human body

Post by angel92 » Wed Nov 12, 2014 2:52 pm

The air that is inhaled is about 20-percent oxygen, and the air that is exhaled is about 15-percent oxygen, so about 5-percent of the volume of air is consumed in each breath and converted to carbon dioxide. Therefore, a human being uses about 550 liters of pure oxygen (19 cubic feet) per day.

The average person takes about 28,800 breaths a day

How much oxygen does one breath contain that is used by the human body.

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Post by BasicBiology » Sun Nov 16, 2014 7:16 pm

The volume of air that is inhaled varies between person and with the depth of each breath. Obviously some breaths inhale more air than others and inhalation can range between ~400ml to ~5L. The efficiency of respiration also reduces with age and is reduced in smokers.

Anyway, to give you an answer: if we worked with an average resting breath of around 350ml of air that reaches the lungs, and 20% of that is oxygen we have around 70ml of oxygen in each breath. 5% of that is used, so approximately 3.5ml of oxygen would be used per breath.

On average a human body produces around 1kg of CO2 a day.
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Re: respiration of human body

Post by Kerenaae » Thu Jan 08, 2015 1:36 pm

The average adult at rest inhales and exhales something like 7 or 8 liters (about one-fourth of a cubic foot) of air per minute. That totals something like 11,000 liters of air (388 cubic feet) in a day.

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