What effect do hot temperatures have on the body?

Hot temperatures can have a significant impact on the body, leading primarily to fatigue and dehydration. When exposed to high temperatures, the body tries to regulate its internal temperature by perspiring. Sweating can lead to fluid loss, and if these fluids are not replenished, dehydration occurs.

This dehydration can result in several physical symptoms, such as tiredness, weakness, dizziness, and an overall reduction in performance levels. Additionally, the increased body temperature can make it harder for individuals to maintain energy levels, leading to feelings of fatigue. This is particularly critical in aviation, where optimal performance and alertness are essential for safe operations.

The other options suggest a positive effect of heat, which is not typically the case in hot conditions. Instead, the reality of fatigue and dehydration is more aligned with how extreme heat impacts an individual's physical and mental abilities.