Rick Hanson:—Ready for Action:—sounds like some old John Wayne movie. Part one. The fight or flight mechanism in specific detail, nothing to fear.


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“Within a second or two of the initial alarm, your brain is on red alert, your SNS (Sympathetic nervous system) is lit up like a Christmas tree, and stress hormones are washing through your blood.
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In other words, you’re at least a little upset. What’s going on in your body?
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Epinephrine increases your heart rate (so your heart can move more blood) and dilates your pupils (so your eyes gather more light).
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Norepinephrine shunts blood to large muscle groups.
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Meanwhile, the bronchioles of your lungs dilate for increased gas exchange—enabling you to hit harder or run faster.
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Cortisol suppresses the immune system to reduce inflammation from wounds.”
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