Give other examples of disturbances in the internal environment that can act as a stimulus.
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Estrogen production during menstrual cycles in females
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The menstrual cycle in females begins with the production and release of estrogen in the ovaries.
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Estrogen becomes the stimulus which facilitates a positive feedback mechanism to produce other hormones needed in the occurrence of menstrual cycles like GnRH and LH.
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This hormone travels to and triggers the hypothalamus to produce other succeeding vital hormones such as the GnRH of gonadotropin releasing hormone. The GnRH then travels to the pituitary gland, more specifically the anterior side to facilitate the production of another hormone called LH or luteinizing hormone. In turn, LH travels back to the ovaries to trigger it further in producing more estrogen.
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Temperature regulation during fevers
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When our bodies contract fever, our body temperature significantly increases beyond normal.
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This increase in body temperature is the stimulus that causes a negative feedback mechanism to help regulate the body temperature and prevent hyperthermia or too much heat in the body.
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With such stimulus, the brain signals different body organs to aid in releasing the excess heat like the skin to release heat in the form of sweat. Another possible signal to aid in releasing heat is through urine excretion. The brain signals the urinary bladder with the release of accumulated urine even if it's not full so that heat may also escape through its excretion.
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