PHYSIOLOGY
CARDIOVASCULAR PHYSIOLOGY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Which ion allows hemoglobin to readily bind with oxygen?
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Fe2+
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Na+
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K+
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Ca2+
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Explanation:
Detailed explanation-1: -Both haemoglobin and myoglobin contain iron, in the form of Fe2+, and it is the iron that binds to oxygen molecules.
Detailed explanation-2: -Upon oxygen binding, the iron moves into the plane of the protoporphyrin ring. The interaction between iron and oxygen exists as resonance structures, one with Fe2+ and O2 and another with Fe3+ and superoxide ion (O2-). Superoxide is very reactive, and should it leave the heme, ferric iron (Fe3+) would result.
Detailed explanation-3: -So, the correct answer is ‘Fe2+’.
There is 1 question to complete.