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A nerve axon depending on a sodium gradient to fire
Neural chemistry

Why nerves misfire when you only drink water

Shivering and sympathetic activation in the first minutes of cold
Hormones and signaling

Cold hits the nerves first and the thyroid later

Lactate leaving working muscle and being taken up by heart and other muscle
Energy metabolism

Lactate is a fuel, not the thing that burns

The hour after orgasm, with prolactin rising as arousal falls
Hormones and signaling

What an orgasm changes in the next hour