<prompt> The number of Fe atoms in one Hb molecule1248  <response>: Hemoglobin is a globular molecule made up of four subunits. Each subunit contains a heme moiety conjugated to a polypeptide. Heme is an iron-containing porphyrin derivative.So, hemoglobin 4 globins 4 heme groups Since each heme molecule contains an iron, so total iron atoms present in hemoglobin are 4 in number.70 of the iron in the body is in hemoglobin, 3 in myoglobin, and the rest in ferritin, which is present not only in enterocytes, but also in many other cells. 