One very important thing to note is that the Oxygen - Hemoglobin dissociation curve has a sigmoidal shape. It is not linear. After a certain point, around 90 %,

One very important thing to note is that the Oxygen - Hemoglobin dissociation curve has a sigmoidal shape. It is not linear. After a certain point, around 90 %, there is a very sharp drop-off. https://en.m.wikipedia.org/wiki/Oxygen–hemoglobin_dissociation_curve https://en.m.wikipedia.org/wiki/Oxygen–hemoglobin_dissociati...