Question

we intake oxygen so why we exhale carbon dioxide gas?

Answer 1

Glucose plus oxygen produces carbon dioxide, water and energy. ... The permanent gases in air we exhale are roughly 78 per cent nitrogen, 15 to 18 per cent oxygen (we retain only a small amount), 4 to 5 per cent carbon dioxide and 0.96 per cent argon, the CO2 being of course used by plants during photosynthesis.

Answer 2

✴High organisms like Humans take oxygen from external surrounding environment for cellular respiration.
✴ A fairly important one is the production of ATP, the energy all of our cells use.
✴ In the process, electrons are used and oxygen has a high affinity for electrons.
✴The waste products of this process are Carbon Dioxide and Water, in different steps along the way.

Hence, chemical reaction during aerobic respiration can be stated as:-
C6H1206+6O2 ➡ 6CO2+6H2O+Energy



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