Stress can be explained using the scenario where we are walking from our igloo and we see a giant polar bear growling at us. The heart rate increases, blood pressure goes up, blood vessels expand, muscles are being fed energy from fuels that are being made from stored fats, the respiratory drive goes up, we sweat to keep us cool because we’re about to exert ourselves, the blood thickens to clot faster than normal, we produce inflammatory chemicals to activate our immune cells to start mobilizing for tissue repair, the attention centre in the brain lights up; it’s a massive change in our system. It’s all designed to deal with a clearly perceived environmental threat. Have you seen that Leonardo Dicaprio movie "The Revenant"? This type of thing used to happen.
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