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2. Hypothalamus

The amygdala sends its message to the hypothalamus, which acts as a command center and uses the autonomic nervous system to elicit involuntary responses in the body. When the fight, flight, or freeze response kick in, the sympathetic nervous system works like a gas pedal. It quickly accelerates activity by sending signals through the nerves to the adrenal glands.

gas pedal accelerate DjelicS / Getty Images
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