Section: Coach Hot — How Heat Works
This section covers Chapter 1, Lessons 1.1 through 1.4.
Part A — Vocabulary (20 points, 2 points each)
Select the best answer for each question.
1. Thermoregulation is:
A) Regulation of muscle tone B) The body's ability to keep internal temperature within a narrow range C) A type of digestion D) Regulation of blood pressure
2. The hypothalamus in this chapter is described as:
A) A muscle in the chest B) A small brain region that acts as the body's thermostat C) A part of the digestive system D) An endocrine gland in the neck
3. Vasodilation in response to heat:
A) Narrows blood vessels to protect the core B) Widens blood vessels, especially in the skin, to release heat C) Pumps blood out of the skin to deeper tissues D) Stops sweating
4. Evaporative cooling refers to:
A) The cooling effect of cold drinks B) The cooling that happens when liquid water turns into vapor and carries heat away C) Cooling through convection only D) Cooling caused by shade
5. Eccrine glands are:
A) Tear glands B) The body's main cooling sweat glands, distributed across nearly all the skin C) Scent glands only D) Glands found only in armpits
6. Humidity affects heat tolerance because:
A) Humid air contains less oxygen B) High humidity slows sweat evaporation, reducing the body's ability to cool itself C) Humidity raises core temperature directly D) Humidity has no effect on cooling
7. Heatstroke is:
A) A mild form of heat exhaustion B) A medical emergency in which core temperature climbs above 40°C with altered mental status C) Always preceded by clear warning D) Treated by drinking ice water
8. Hyponatremia, in the context of heat, refers to:
A) High blood sodium from sweating B) A dangerous dilution of sodium in the blood, sometimes from drinking only plain water during long sweat sessions C) A form of dehydration D) A heat-induced muscle injury
9. Plasma volume expansion is:
A) A short-term loss of fluid from the blood B) A long-term increase in liquid plasma in the blood, often as an adaptation to heat or endurance training C) A dangerous medical condition D) The same as dehydration
10. Wet bulb temperature is:
A) The temperature of a wet thermometer at sea level B) A measurement combining temperature and humidity that indicates whether sweat will evaporate C) The temperature of bathwater D) Used only by meteorologists
Part B — Concept Comprehension (20 points, 2 points each)
Select the best answer for each question.
11. The brain region that acts as the body's thermostat is the:
A) Cerebellum B) Pituitary gland C) Hypothalamus D) Brainstem
12. Approximately how much heat energy does one gram of evaporating sweat carry away from the body?
A) About 50 calories B) About 200 calories C) About 580 calories D) About 1,000 calories
13. During significant heat exposure, skin blood flow can increase by approximately:
A) 10-20 percent B) Two-fold C) Five-fold D) Ten-fold or more
14. Which type of sweat gland is responsible for most of the body's cooling?
A) Apocrine B) Sebaceous C) Eccrine D) Holocrine
15. Humid heat is harder for the body to manage because:
A) Heart rate cannot rise in humidity B) Sweat evaporates more slowly when air is already moist C) The hypothalamus shuts down at high humidity D) Vasodilation stops working in humid conditions
16. The hallmark distinguishing sign of heatstroke compared with heat exhaustion is:
A) Heavier sweating B) Faster heart rate C) Altered mental status (confusion, disorientation, unconsciousness) D) A cooler core temperature
17. Alcohol is particularly risky in heat because it:
A) Increases muscle strength B) Interferes with vasoregulation, accelerates dehydration, and masks warning signs C) Speeds up sweat evaporation D) Lowers core temperature reliably
18. Behavioral thermoregulation is described as:
A) The least powerful defense against heat B) The first and most powerful line of defense — moving to shade, removing layers, adjusting environment C) A medical intervention D) Effective only in adults
19. Hidromeiosis refers to:
A) Increased sweat rate over time B) A reduction in sweat output when skin stays wet for long periods C) A type of heat illness D) A measurement of sweat composition
20. During heat acclimatization, several things change in the body. Which of the following is correct?
A) Sweat becomes saltier and more concentrated B) Sweat becomes more dilute (less sodium per liter), plasma volume expands, and heart rate at given workload decreases C) The body stops sweating entirely D) Core temperature rises permanently
Part C — Application (30 points, 6 points each)
Write 2-4 complete sentences for each question. Show your reasoning.
21. Explain why behavioral thermoregulation (changing your environment — moving to shade, slowing down, removing layers) is considered the first and most powerful line of defense against heat.
22. A friend has been sitting in a hot car for 20 minutes and now feels dizzy, weak, and nauseated. They are sweating heavily, their skin is cool and clammy, and they look pale. Describe what you would do, why, and what signs would tell you the situation is more serious.
23. Why does sweating heavily during a long exposure increase the risk of muscle cramps, and how would you reduce that risk?
24. The body's cardiovascular response to heat shares some features with moderate exercise. Identify two of those features and explain why sitting in heat is still not a substitute for movement.
25. Coach Hot describes heat as "a teacher, not a punishment." Explain what this framing means and why it matters for how a high school student should approach heat exposure across their life.
Continue to the next section.