What happens when our bodies are exposed to a sudden stress or threat?
When our bodies are exposed to a sudden stress or threat, we respond with a characteristic "fight or flight" response. The ''adrenaline rush'' we experience is a result of the release of the hormones epinephrine (adrenaline) and norepinephrine. They cause an increase in blood pressure and pulse rate, faster breathing, and increased blood flow to the muscles.
From: Meditation, Stress, and Your Health WebMD Medical Reference
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