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Butterflies in the stomach
The stomach is stimulated by a nerve. Falling in love or being interested in someone awakens the pleasure system that causes responses in the body. The feeling of butterflies in your stomach is just a sign of bodily stress. Dopamine is the first neurotransmitter to manifest itself when you see someone attractive. The release of different hormones causes the heart rate to accelerate, the temperature of the face to rise and cause the color change in the cheeks.
