Epinephrine
Medical term · E
A chemical that narrows blood vessels, increases heart rate, and helps trigger the fight-or-flight response to danger. Also called adrenaline.
Related terms
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Blood vesselsHollow tubes that transport blood throughout the body; includes arteries, veins, and capillaries.
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AdrenalineStress hormone that puts the body on high alert. Changes include faster heartbeat, more rapid breathing, greater energy, and higher blood pressure. Also called epinephrine.
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Heart rateThe number of times the heart contracts in a minute, normally 60–100 times.
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TriggerAnything that can set off symptoms.