Define oxygen dissociation curve Can you suggest any reason for its sigmoidal pattern - Biology - Breathing and Exchange of Gases

Question

Define oxygen dissociation curve Can you suggest any reason for
its sigmoidal pattern?

Kunal Sharma · Accepted Answer

The oxygen dissociation curve is a graph showing the percentage
saturation of oxyhaemoglobin at various partial pressures of
oxygen
The curve shows the equilibrium of oxyhaemoglobin and
haemoglobin at various partial pressures
In the lungs, the partial pressure of oxygen is high Hence,
haemoglobin binds to oxygen and forms oxyhaemoglobin
Tissues have a low oxygen concentration Therefore, at the
tissues, oxyhaemoglobin releases oxygen to form haemoglobin
The sigmoid shape of the dissociation curve is because of the
binding of oxygen to haemoglobin As the first oxygen molecule binds
to haemoglobin, it increases the affinity for the second molecule
of oxygen to bind Subsequently, haemoglobin attracts more
oxygen

Define oxygen dissociation curve. Can you suggest any reason for its sigmoidal pattern?