The electrical charge of the RBC is maintained during carbon dioxide transport by the inward movement of
A
Hydrogen ions
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B
Oxygen
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C
Chloride ions
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D
Bicarbonate ions
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Solution
The correct option is C Chloride ions The blood carries much of the carbon dioxide in its bicarbonate form. The capacity of blood to carry carbon dioxide as bicarbonate is enhanced by an ion transport system inside the red blood cell membrane. This system simultaneously moves a bicarbonate ion out of the red blood cell and into the plasma in exchange for a chloride ion. The simultaneous exchange of these two ions is known as chloride shift.