Haemoglobin and gas transport
HAEMOGLOBIN AND GAS TRANSPORT · IMAT Doutor1 / 1
Why does the sigmoidal shape of the oxygen–haemoglobin dissociation curve make haemoglobin an efficient oxygen transporter?
A
It makes the affinity constant at every partial pressure, so oxygen is released at a steady rate throughout the body
B
It allows four molecules of CO₂ to be carried at the same time as oxygen, on the same binding sites
C
It prevents the Bohr effect from occurring, so the affinity is not disturbed by changes in pH or carbon dioxide
D
It stays nearly saturated over the range of pressures in the lungs and unloads steeply over the range found in the tissues
E
It allows oxygen to be bound irreversibly in the lungs and released only when the red cell is destroyed
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