Body Fluids and Circulations

Question

How many molecules of oxygen can bind to a molecule of haemoglobin?

  • One

  • Two

  • Three

  • Four

Answer

D.

Four

Each haemoglobin molecule has four iron atoms, each of which can combine with a molecule of oxygen through coordinate bond O=O. Hence, total four molecules of oxygen can bind (or combine) with one molecule of haemoglobin.

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