Final answer:
To prevent heat-related illnesses, it's important to avoid heavy exertion, stay hydrated, and seek shade to avoid direct sun exposure. These measures, along with understanding the body's sweat response, are crucial for staying cool.
Step-by-step explanation:
To help prevent heat-related illnesses, measures such as avoiding heavy exertion, drinking water frequently, and avoiding working in the direct sun are all effective strategies. The human body's response to heat typically involves sweating for evaporative cooling; however, in humid environments, this sweat response is less effective due to the moisture in the air. Furthermore, ensuring adequate water intake and adjusting the timing of daily activities to avoid direct sunlight can significantly reduce the risk of heat-related illnesses.