Final answer:
Menstrual cramps are not caused by norepinephrine but by prostaglandins.
Explanation:
False. The cramping associated with premenstrual syndrome is not due to norepinephrine. Menstrual cramps are primarily caused by the release of prostaglandins, not norepinephrine. Norepinephrine is a neurotransmitter involved in the sympathetic nervous system's response to stress.
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