Where do the corpuscles of the blood get their loads of oxygen?
What gas do they give up in exchange for the oxygen?
Where do they get the carbon dioxide?
How does air entering the lungs differ from air leaving them?
What corresponding change takes place in the blood while it is in the lungs?
Explain how the change is effected in each case.
Suppose we breathe air that contains too little oxygen, what will be the effect on the corpuscles?
What will be the effect on oxidization in the tissues?
And what is the effect of poor oxidization on physical vitality?
On mental vitality?