Does AC C rely on an assumption that the number of oxygen molecules is the total number of oxygen molecules picked up by the hemoglobin? If the hemoglobin that picked up one oxygen molecule is picking up that one in addition to 3 oxygen molecules that it is already carrying, then would it not be as equally "effective" as the hemoglobin that has picked up 3 oxygen molecules if in addition to one that it was already carrying? Both hemoglobin molecules would be at their maximum capacity of 4 with their effectiveness at picking up oxygen molecules now equal (whatever that quantification means here).

I am taking in October, but would love to join you!

Interested!