Question

calculate the increase in the percentage of oxygen absorbef by the lungs during exercise​

Answer 1

Answer:

We breathe oxygen into the body from the atmosphere. While this oxygen does not itself contain useable energy, it is the key that unlocks the energy stored in previously-ingested food. As the energy demands of the contracting muscles change during exercise, so must their energy and oxygen provision. But oxygen comprises only 21% of the atmospheric air; one therefore needs to inhale a volume of air each minute which is at least five times the volume of oxygen which is being absorbed out of the lungs by the body.