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Urgent help needed please: My biology as level paper 1 retake exam's tomorrow!!!! watch

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    28 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.

    Please explain ASAP why B is the correct answer... EXAM'S TOMORROW!!!!
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Updated: November 12, 2015
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