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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

You notice her out of the corner of your eye
nonchalantly sweeping her gaze over her surroundings, her chin resting
lazily in the palm of her hand. She is clad in the bright steel armor
of a knight. Her helmet sits beside her, a long sword lays at her feet
encased in its metal sheath, and a long green cloak drapes across her
back. She looks over to you, sits up somewhat, and waves at you like an
old friend as a warm smile spreads across her face. Sunlight filters
through the trees above, dancing off her green eyes and making them
sparkle. Her lovely face is lightly painted by the sun, a light tan
color, and is surrounded by a long silky mass of sable brown hair. You
really can't help but smile back. Seemingly content with your response,
she nods at you and once again turns away.

Zelea is a very pretty looking girl. Her eyes
are pearls with a little bit of night sky painted
on. Her lips painted with a lush pink carnation
her hair the finest silk dyed in the deepest red
of roses. Her skin once soft and golden clay
and her body strong like the oak tree from which
she was carved. Her sense of sight is like that
of a hawk's, her sense of sound is like that of
a rabbit's. Her sense of smell is like that of
a wolf. Her sense of touch is like that of a blind
fish in dark water. Her sense of taste is as accute
as that of a snake's. Her voice sounds like a
heavenly nightengale's call and her shyness
like that of all Gaea's creatures, for she is Gaea
herself, her daughter.