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Questions and Answers
True or false: The majority of CO2 is transported via bicarbonate.
True
True or false: CO2 diffuses down its concentration gradient into red blood cells (RBCs).
True
True or false: Carbonic acid is hydrolysed into H+ ions and HCO3–.
True
True or false: The H+ ion is bound by haemoglobin which buffers the process.
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True or false: At the lungs, H+ dissociates from haemoglobin and combines with bicarbonate to form carbonic acid.
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True or false: The reverse reaction at the lungs is catalysed by carbonic anhydrase.
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True or false: Chloride shift refers to the exchange of bicarbonate and chloride across the membrane of red blood cells (RBCs).
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True or false: CO2 diffuses freely into RBCs but HCO3– ions cannot easily cross the cell membrane.
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True or false: A carrier protein is utilised to allow HCO3− to leave the RBC in exchange for chloride ions.
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