What typically happens to cabin pressure during descent?

During descent, cabin pressure decreases, and it is essential to manage this process to ensure passenger comfort and safety. The outflow valves play a crucial role in regulating cabin pressure as an aircraft descends. By adjusting the outflow valves appropriately, the rate of pressure change can be controlled to avoid rapid fluctuations that could be uncomfortable or even harmful to passengers and crew. This controlled approach helps to equalize the pressure gradually as the aircraft descends closer to the ground, mitigating the risk of barotrauma and other discomforts associated with quick changes in cabin pressure.

The incorrect options relate to aspects that are either unrelated to cabin pressure management or not standard procedures during descent. For instance, the idea of rapidly increasing pressure is contrary to what actually occurs during descent, while turning off cabin ceiling fans is not a common practice during this phase. Emergency oxygen masks are deployed in situations of cabin depressurization, which is a separate occurrence triggered by safety protocols rather than standard pressure regulation during descent.