A-Level Biology AQA Notes

3.3.4 Mass transport in animals

Mass transport in animals

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Mass Transport in Animals

Red blood cells transport oxygen using the protein haemoglobin

Haemoglobin is made up of four polypeptide chains, each containing a prosthetic haem group. Each haem group binds one oxygen molecule
Binding of the first O2 molecule causes a conformational change in the haemoglobin, making the haem groups more accessible to oxygen.
Bohr affect- haemoglobin’s oxygen binding affinity is inversely related to the concentration of carbon dioxide, causing the oxygen dissociation curve to shift
The cardiac cycle is the sequence of events that occur within one full beat of the heart.

Circulatory system:

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