Final answer:
Rebreathing exemplified by breathing into a paper bag and results in the accumulation of carbon dioxide (CO2), which can help to correct hyperventilation-induced respiratory alkalosis by restoring normal CO2 levels.
Step-by-step explanation:
When discussing rebreathing, it refers to a scenario in which air that has just been exhaled is inhaled again, which can increase the level of carbon dioxide (CO2) in the blood. One common example of rebreathing is when an individual breathes into a paper bag. This is sometimes done when someone is hyperventilating, in an attempt to restore CO2 levels in the body to stop the hyperventilation, but it should be done with caution and under certain circumstances to avoid causing harm.
So the correct answer to the student's question is that rebreathing is exemplified by breathing into a paper bag and results in the accumulation of carbon dioxide (CO2). It does not result in respiratory alkalosis, but rather it can help to treat it by restoring normal CO2 levels in the case of hyperventilation-induced respiratory alkalosis. Hyperventilation, on the other hand, reduces CO2 levels and can lead to high (alkaline) blood pH, known as respiratory alkalosis.