Once you do get away and are back in the safety of your cave, both the SAM and the HPA axes are designed to shut themselves down. The body uses a sort of stress thermostat called feedback inhibition that triggers the stress response to turn itself off once it has done its job. High levels of adrenaline and cortisol feed back to the parts of the brain that initiate the stress response and turn them off. What an incredibly evolved system! Especially if you live in a forest and there are bears. But what happens when you can’t experience safety in your cave because the bear is living in the cave
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