Butterflies in the stomach
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Look up have butterflies in one's stomach in Wiktionary, the free dictionary. |
Butterflies in the stomach is the physical sensation in humans of a "fluttery" feeling in the stomach, caused by a reduction of blood flow to the organ. This is as a result of the release of adrenaline in the fight-or-flight response, which causes increased heart rate and blood pressure, consequently sending more blood to the muscles.[1]
See also
References
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