Menstruation

We’ve seen that negative and positive feedback loops are fairly straightforward concepts. That’s because we were thinking of just one variable which either gets kept constant or gets increased/decreased continually. What happens when you have a complex interplay between 4 different variables?

The Mammalian Oestrus is Controlled by 4 Hormones: FSH, LH (pituitary gland), Progesterone and Oestrogen (ovaries)

FSH is follicle-stimulating hormone (it stimulated follicles to develop which are immature eggs surrounded by other cells). LH is luteinising hormone (it stimulates the corpus luteum to develop which literally means yellow body and literally is a yellow body which secretes progesterone and forms from the “ashes”/remains of the follicle following…