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Interactive Physiology The Respiratory System: Gas Transport Oxygen transport in the blood: _98.5____% is bound to hemoglobin _1.5____% dissolves in plasma The hemoglobin molecule is composed of _4__ polypeptide chains and _4__ heme groups containing iron. What does oxygen bind to? ___hemoglobin______ After one oxygen molecule (O2) binds to hemoglobin, it is easier for the.
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