The chloride shift refers to the movement of chloride ions
Correct answer: B. into the red cell to balance the hydrogen carbonate ions leaving it
- A. out of the red cell as oxygen enters
- B. into the red cell to balance the hydrogen carbonate ions leaving it
- C. from the plasma into the alveolar air
- D. into the plasma from the kidney tubules
Explanation
As hydrogen carbonate ions formed inside the red cell diffuse out into the plasma, the cell would be left with a net positive charge, so chloride ions move in to keep it electrically neutral. This exchange lets the red cell keep converting carbon dioxide rapidly all the way through the tissue capillaries. In the lungs the whole sequence runs in reverse and chloride moves back out.
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About Gaseous Exchange in Lungs
Gaseous exchange in the lungs occurs across the thin, moist alveolar and capillary surfaces, where oxygen and carbon dioxide diffuse down partial pressure gradients. The topic covers alveolar adaptations, ventilation, the role of haemoglobin in oxygen transport, carbon dioxide carriage, and the difference between external gas exchange and cellular respiration.
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