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       A Very Large Black Dragon Stands Before You, You Smell The Rotting Flesh Hanging From His Armor.

Aged in French oak, he's got a long and glorious life ahead!

the hemoglobin molecules in RBCs consist
of a protein called -globin-, composed of four polypeptide chains,
plus four groups called -hemes- (Figure 14.3b).  Each heme group
is bound to one polypeptide chain and contains an iron ion that
can combine with one oxygen molecule.  The hemes bind the
oxygen molecules picked up in the lungs and transport them in
the blood.  The hemes release oxygen, which difuses into the in-
terstitial fluid and then into cells.  Because RBCs lack mitochon-
dria, they generate ATP anaerobically (without using oxygen)
and do not consume any of the oxygen they transport.

Copyright 2001 by Biological Sciences Textbooks, Inc. and Sandra Reynolds Grabowski