How about something different - brain and the genitals?
specifically the female genitals?
In the brain there is the Hypothalamus, and the pituitary gland -
Which essentially controls the ovaries and the uterus.
when there is not a balance and a feedback system and homeostasis this can lead to problems such as infertility, bleeding, and other problems such as milk breast discharge when not breast feeding and so problems such as stress and anxiety can influence the hormones from the brain such as LH _ Luteinizing hormone to cause this to become upset.
But, when you have a balanced system the feedback mechanism from the ovaries will induce a Surge of LH from the hypothalamus which will induce a surge in the FSH - follicle stimulating hormone form the pituitary gland, this in turn will cause the ovaries to ovulate and hence you get ovulation such that a woman can become pregnant if she has sperm/ semen waiting for her during intercourse.
If there is no pregnancy, then the cycle starts all over.
I hope this helps
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