Section E — Coach Cold — Cold and Your Body
This section covers Chapter 2, Lessons 2.1 through 2.4.
Part A — Vocabulary (20 points, 2 points each)
Select the best answer for each question.
1. Vasoconstriction (Grade 7 detail) is:
A) The widening of blood vessels in heat B) The narrowing of small blood vessels — especially near the skin — to reduce heat loss, controlled by the autonomic nervous system C) A bone movement D) The same as shivering
2. Brown adipose tissue (BAT) is:
A) A type of food B) A specialized fat tissue rich in mitochondria that generates heat directly through a protein called UCP1 — activated by cold C) Always present in dangerous amounts D) The same as white fat
3. UCP1 (uncoupling protein 1) is:
A) A muscle B) A protein in brown fat mitochondria that releases energy as heat (instead of storing it as ATP) — the engine of brown-fat heat production C) A type of vitamin D) The same as melatonin
4. Norepinephrine is:
A) A type of sugar B) A signaling molecule released when the body is cold (and during stress) — triggers vasoconstriction, raises alertness, and activates brown fat C) A vitamin D) Only present in adults
5. The cold shock response is:
A) A specific exercise B) An immediate involuntary reaction when cold water hits the skin: gasp reflex, racing heart, vasoconstriction, breath-rate spike — most dangerous in the first minute C) The same as shivering D) Only happens in summer
6. A cold-water immersion is:
A) Putting your face in a sink of cool water B) Submerging the body or a major part of it in water below typical room temperature — a research topic in adults; not prescribed for minors C) Always safe at any age D) A required school activity
7. Sauna-then-cold (contrast) is:
A) A specific protocol for kids B) A traditional practice in several cultures (Finnish, Russian, others) alternating heat exposure with cold exposure — adult research only C) Always done alone D) Never done by anyone
8. Cold acclimation is:
A) Avoiding the cold B) The body's gradual adaptation to repeated cold exposure — includes faster vasoconstriction onset, better shivering efficiency, and (in some research) increased brown-fat activity C) A medication D) Impossible at any age
9. Frostbite is:
A) An itchy rash B) Tissue damage from freezing in fingers, toes, ears, or nose C) Only seen in animals D) A type of bone
10. Cardiovascular risk in cold exposure is:
A) Negligible at all ages B) A real risk — sudden cold can cause dangerous heart rhythm changes, especially in people with existing conditions; cold-water immersion has caused drownings and cardiac events even in fit adults C) Only present in people over 90 D) The same as a cold
Part B — Concept Comprehension (20 points, 2 points each)
Select the best answer for each question.
11. Vasoconstriction is triggered by:
A) The autonomic nervous system, with norepinephrine as one major signaling molecule B) Your conscious choice C) Only when you wear too many clothes D) The eyes
12. Brown adipose tissue increases its heat production in response to:
A) Warm temperatures B) Cold exposure, which raises norepinephrine and activates UCP1 in brown-fat mitochondria C) Sweet food only D) Sleep
13. Shivering produces heat by:
A) Magic B) Rapid, repeated muscle contractions — each muscle contraction releases heat as a byproduct C) Slowing the heart D) Only when you are sleeping
14. A 12-year-old jumping into cold ocean water without preparation faces the highest risk of:
A) Solar retinopathy B) The cold shock response: involuntary gasping that can pull water into the lungs, rapid heart rate that can be dangerous, and impaired ability to swim C) Heat stroke D) Indigestion
15. Cold-water swimming traditions exist around the world (Russian, Finnish, Korean cold plunge, others) and are practiced:
A) Only by children alone B) By adults, often with cultural and ritual context, typically with safety supports and experience C) Without any history D) Only in summer
16. Coach Cold at Grade 7 does not teach:
A) The cold shock response and its dangers B) Vasoconstriction in detail C) A specific cold-immersion protocol you should follow at home D) Brown fat physiology
17. Combining a long breath-hold with cold-water immersion (such as some popularized "method" practices) is:
A) Recommended at Grade 7 B) Specifically called out as dangerous — the combined breath-hold-plus-water pattern can cause loss of consciousness and drowning; Coach Cold and Coach Breath both reject this combination C) Always safe with a friend D) Only a problem for adults
18. When a friend swims in cold water and starts shivering hard, then becomes confused or stops shivering:
A) They are fine and should keep swimming B) These are warning signs of progressing hypothermia — they need to exit, warm up, and probably need medical help C) That is normal cold adaptation D) They are just being dramatic
19. Cold-induced alertness rises through:
A) Random chance B) Norepinephrine release in the brain — which is part of why cold exposure is alerting; this is a research finding, not a personal protocol C) Caffeine in cold air D) Magic
20. Coach Cold's main message at Grade 7 is:
A) Cold is the enemy B) The cold response is real, measurable, and elegant — and the risks of cold-water immersion are real, especially for minors; understanding both sides is the work C) You should always jump in cold water D) Cold is unimportant
Part C — Application (30 points, 6 points each)
Write 2-4 complete sentences for each question.
21. Describe how brown adipose tissue differs from regular (white) fat. Use the words UCP1 and mitochondria in your answer. What does brown fat do when activated by cold?
22. Explain the cold shock response. What is it, what triggers it, and why is the first minute of cold-water immersion the most dangerous?
23. Safety recognition. A friend wants to try jumping in a cold lake on a winter morning, alone, with no adults around, after holding their breath for a long time. Based on Lessons 2.3 and 2.4, give at least three specific reasons this is dangerous and what you would say to them.
24. Cold-water swimming and sauna-then-cold practices exist across many cultures. Coach Cold presents the research findings about these practices but does not write personal protocols for middle schoolers. Explain why this descriptive-but-not-prescriptive framing is appropriate at your age.
25. Explain how norepinephrine connects cold exposure, vasoconstriction, brown-fat activation, and alertness. (You do not need to memorize chemistry — the connecting role is the point.)
Continue to Section F — Coach Hot.