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Adrenal gland
Small glands located above the kidneys responsible for producing hormones, including epinephrine.
Epinephrine
A hormone and neurotransmitter, also known as adrenaline, produced by the adrenal glands that prepares the body for "fight or flight" responses during stress or excitement.
Hypothalamus
A region of the brain responsible for regulating many physiological processes, including the endocrine system. It sends signals to the pituitary gland to release hormones.