Binds heme and transports it to the liver for breakdown and iron recovery, after which the free hemopexin returns to the circulation. Random hydrolysis of (1->4)-linkages between N-acetyl-beta-D-glucosamine and D-glucuronate residues in hyaluronate. Expressed by the liver and secreted in plasma. The isolated N-terminal domain binds one heme. The full-length protein also binds one heme, but at a different site. The physiological significance of this is not clear (By similarity). Belongs to the hemopexin family. Lacks the conserved His heme iron ligand in position 81. There is a Gln in this position.