Oxygen Disassociation Curves. (:

Aerobic respiration => Glucose => ATP released.

Haemoglobin => Pigement
It enable the bodt to carry round lots of oxygen.

Haemoglobin may vary. Each polypeptide chain (four of them) associates with one haem group, which contains a ferrous Fe2+ ion. This can readily bond to oxygen. It picks up four oxygen molecules.

Haemoglobin without oxygen is blue. Haemoglobin with oxygen is red.

The oxygens leave one at once, not all off of one haemoglobin, and then the next. The first oxygen molecules on all goes, and then the second.

The more oxygen avaliable, the higher the percent saturation with oxygen.

Haemoglobin is in three environments: Tissues, Lungs, Blood Vessels.

In the Tissues and the Lungs, the blood is contained within capillaries that have small pores, meaning the percent saturation can change. In the blood vessels, such as arteries, veins, it cannot change as they are not porus.

Associates with oxygen in the lungs.
Dissociates with oxygen in the tissues.

If there's a high partial pressure (lungs), any drop in it has a small effect in percent saturation, however, if there's a low PP, (tissues) any drop in it has a large effect on percent saturation.

If the curve shifts to the LEFT, there is a greater affinity for oxygen.
If the curve shifts to the RIGHT there is a lower affinity for oxygen.

High affinity => More readily associates with oxygen
Low affinity=> More readily dissociates with oxygen