Question

We can breathe,all the (co, oxygen,cFc sulphur..........) gases in the atmosphere enters to our nose and goes to lungs,but in the alveoli:only oxygen gas can be reached .why?

Answer 1

We inhale nitrogen and other gases also. But in lungs alveoli where the gasses are exchanged only O2 will be taken….because in RBC haemoglobin is present and haemoglobin can only make bond woth oxygen so instead of other gasses we can take only oxygen..

Also, All aerobic creatures need oxygen for cellular respiration, which uses the oxygen to break down foods for energy and produces carbon dioxide as a waste product. Breathing, or "external respiration", brings air into the lungs where gas exchange takes place in the alveoli through diffusion.

Answer 2

The Hemoglobin takes only O2