Write a formula representing the reaction between haemoglobin and oxygen. What factors influence the rate and direction of the reaction?

The reaction between hemoglobin and oxygen can be represented as:

\[ \text{Hb} + \text{O}_2 \rightleftharpoons \text{HbO}_2 \]

Where:
- \(\text{Hb}\) is deoxygenated hemoglobin.
- \(\text{O}_2\) is oxygen.
- \(\text{HbO}_2\) is oxyhemoglobin.

The rate and direction of the reaction are influenced by several factors:

1. Partial Pressure of Oxygen (pO₂): 
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