What happens to a person's body during rapid decompression?

During rapid decompression, the changes in atmospheric pressure can lead to a forced expulsion of air from the lungs. This happens because, as outside pressure drops suddenly, the higher pressure inside the lungs causes the air to rush out. The rapid decrease in pressure can create a situation where the volume of air in the lungs expands beyond normal, potentially leading to explosive decompression. Moreover, this expulsion of air can trigger a series of physiological responses, including difficulty breathing, as the body struggles to adapt to the significant difference in pressure.

While the other options present scenarios that may seem plausible at first thought, they do not accurately represent the physiological effects of rapid decompression. For example, the sensation of warmth is not typically associated with decompression; rather, the body may experience a cooling effect due to the rapid drop in pressure. Breathing becoming easier contradicts the challenges that typically arise in such scenarios, where breath control and gas exchange are compromised. Lastly, the idea of floating up implies a buoyancy effect not directly linked to the body's reaction to decompression, which typically leads to a range of other critical responses.