On Tue, 26 May 2020 21:43:17 -0700 (PDT), "
wrote:

Its called getting tired. Your muscles get tired from use. And when you stop you get rest. And maybe, possibly, you drink something and get rehydrated. But your BLOOPD SUGAR, the amount of glucose in your blood stream, remains very stable. Your endocrine system, specifically your pancreas, keeps your blood sugar very stable. It has to do that to allow your body to work properly. Remember your heart and lungs are muscles and are always working. They need a constant source of energy to function correctly. And all the rest of the cells in your body need a continuous, constant amount of sugar/energy to operate correctly. Your body, and all animal bodies, is very good at this task. All animal bodies keep blood sugars constant. Or else the animal dies.

Mammal bodies are even better at maintaining a constant temperature.

Therefore, nobody has ever died of falling into ice water.

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Joy Beeson
joy beeson at comcast dot net