Give other examples of disturbances in the internal environment that can act as a stimulus.
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Menstrual cycle: Estrogen and Progesterone
A woman's body's estrogen and progesterone levels during the menstrual cycle can also act as a stimulus in a feedback system. As hormone levels rise, the female brain and pituitary glands respond by producing fewer hormones. The signal will be the estrogen hormone, which will bind to the receptor molecules in the cell. Once the egg is released during ovulation as a result of the menstrual cycle, we know that the woman gets pregnant if the fertilized egg is implanted in the uterus. However, if the egg is not fertilized, it will dissolve, and the menstrual cycle will begin again.