🔍 Key Concepts

• Body’s cooling mechanism through sweating in hot environments • Role of both water and salt (electrolytes) in maintaining circulation and muscle/nerve function • Difference between simple dehydration and heat exhaustion

💭 Think About

• Ask yourself what the body is losing in a hot engine room when a person is sweating heavily for a long period of time. • Consider whether just drinking plain water, without replacing salt, always fixes the problem of feeling weak, dizzy, and exhausted in the heat. • Think about which option best matches the idea that heat exhaustion is a problem of both fluid volume and electrolyte balance, not just ‘being thirsty’.

✅ Before You Answer

• Identify which options involve loss of both water and salt versus water only. • Check whether the answer choice assumes ‘adequate’ or ‘inadequate’ replacement, and which of those is more likely to lead to heat exhaustion. • Make sure the choice you pick clearly reflects a combination of heavy sweating plus failure to replace what is lost.