How digestion works: what happens to food after you eat it
Exercise and blood sugar: why a working muscle takes sugar without insulin
Carry boxes up the stairs for an hour, and your muscles pull sugar out of your blood with no help from insulin. How does a muscle let sugar in all by itself?
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Three o'clock. You carry another box up three floors. The muscles of your legs and arms work hard, and their work burns sugar.
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At first, each muscle cell takes most of its sugar from its own glycogen, the store it filled up after lunch. But the store gets smaller, and the muscle wants sugar from the blood too. By now, the insulin sent after lunch is mostly gone. So who opens the doors?
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