After viewing the 'So fit that you die?' video, you should be able to answer the following questions. 

1. Why have dozens of endurance athletes died in their sleep over the last few decades? 

2. How can a cyclist's heart rate be slower than an elephant's?

After viewing the TedED video, you should be able to answer the following questions:

1. Describe three scenarios in which you may begin sweating.

2. Briefly outline how your body produces heat.

3. What is the part of the brain that is responsible for regulating your temperature?

4. What is the immediate source of water for the sweat that the sweat gland produces?

5. The sweat that pools up from the sweat glands is usually hypotonic to the body fluids from which it came. Why is it advantageous for sweat to be less salty than body fluids?

6. All living cells are surrounded by fluid. If sweat comes from the fluid surrounding the cells of the sweat gland, then how does the body replace that fluid to keep those cells alive?