The organic ring component of heme is Question Blank 1 of 6 Answer . Under normal conditions, the central atom in this group is Question Blank 2 of 6 Answer . In Question Blank 3 of 6 Answer , the central atom in heme is displaced 0.4 Angstroms out of the plane of the heme system. The central atom can coordinate six bonds: Question Blank 4 of 6 Answer to nitrogen atoms in heme, one to a Question Blank 5 of 6 Answer residue and Question Blank 6 of 6 Answer to oxygen.