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The brain and blood are related because hormones regulating the menstrual cycle act as chemical signals sent through the blood between the brain, ovaries, and uterus [1].
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Understanding the Phases of the Menstrual Cycle - Clue helloclue.com 1 fact
claimThe menstrual cycle is regulated by hormones, which act as chemical signals sent through the blood between the brain, ovaries, and uterus.