What explains how the uptake of oxygen is maximised as blood passes through the capillaries of
the lungs?
A Each haemoglobin molecule can temporarily bind to four oxygen atoms.
B Oxyhaemoglobin formation increases the capacity of red blood cells to transport oxygen.
C The binding of the first oxygen molecule to haemoglobin decreases the molecule’s affinity for
binding other oxygen molecules.
D The dissociation of carbon dioxide from carboxyhaemoglobin allows more haemoglobin to be
available for oxygen binding