IB Biology Sub-topic B3.1 Definitions
This page contains our IB Biology definitions for sub-topic B3.1. By learning each one of these definitions, you will fully cover the content for IB Biology 'Further gas exchange'.
HL
Allostery
A structural change in haemoglobin when oxygen binds to one of its haem groups, increasing the affinity of the other subunits for oxygen
HL
Bohr Shift
The change in the oxygen dissociation curve due to variations in pH, carbon dioxide levels, and temperature, affecting haemoglobin's oxygen affinity
HL
Cooperative Binding
The phenomenon where the binding of oxygen to one haemoglobin subunit increases the affinity of the other subunits for oxygen
gas exchange
The process of oxygen and carbon dioxide diffusing across the walls of the alveoli
HL
Myoglobin
A protein in muscle tissue composed of one α chain with one haem group, having a higher affinity for oxygen and storing it for muscle respiration
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