Which of the following are signs of heat exhaustion?

Heat exhaustion is a condition that occurs after prolonged exposure to high temperatures, often combined with dehydration, causing the body to struggle in regulating its temperature. The symptoms associated with heat exhaustion include heavy sweating and weakness, which are direct indicators of the body's response to overheating. As the body sweats excessively to cool itself, the individual may feel weak and fatigued due to the loss of fluids and electrolytes.

Heavy sweating is a body's natural mechanism to dissipate heat, and when paired with feelings of weakness, it signals that the body is becoming overwhelmed. In the case of heat exhaustion, it's crucial to recognize these signs early to prevent progression to heat stroke, which is a more severe condition.

The other options present symptoms that may not specifically align with heat exhaustion. Fever and vomiting are generally associated with infections or illnesses, while shivering and a slow pulse don’t typically occur in heat exhaustion; instead, they are more indicative of conditions like hypothermia. Increased thirst and headache can be symptoms of dehydration but are less specific compared to heavy sweating and weakness as classic signs of heat exhaustion.