Which of the following is a symptom of heat exhaustion?

The correct choice identifies a weak rapid pulse and low blood pressure as symptoms of heat exhaustion. This condition arises when the body loses an excessive amount of water and salt, often due to prolonged exposure to high temperatures or intense physical activity in hot environments. As the body struggles to cope with overheating, the cardiovascular system may become compromised, leading to symptoms such as a weak and rapid pulse and a drop in blood pressure. This reflects the body's attempt to maintain blood flow and cooling, yet indicates that the body's compensatory mechanisms are failing.

In contrast, while excessive sweating is indeed a symptom of heat exhaustion, it’s a sign of the body's attempt to cool down and doesn't fully encapsulate the seriousness of the physiological changes happening within. The skin becoming dry and hot is more indicative of heat stroke rather than heat exhaustion; in heat exhaustion, the skin often remains cool and moist due to sweating. Excessive shaking is not commonly associated with heat exhaustion and could suggest another condition, such as hypothermia or psychological factors. Understanding these distinctions is critical for effective assessment and response to individuals displaying signs of distress from heat.