Which of the following interactions is an example of a negative-feedback control system...?

. Which of the following interactions is an example of a negative-feedback control system in the human female reproductive cycle?





a. the stimulation of follicles to mature in response to the production of FSH and LH by the anterior pituitary


b. the effect of estrogen produced by a follicle on the LH and FSH produced by the anterior pituitary


c. the transformation of the cells of the ruptured follicle into the corpus luteum


d. the high level of estrogen that causes the anterior pituitary to release a surge of LHWhich of the following interactions is an example of a negative-feedback control system...?
d is an example of positive feedback so that is out





b seems more likely an increase in estrogen will decrease LH secretion since their is more estrogen in the bloodstream which might in turn have an effect on FSHWhich of the following interactions is an example of a negative-feedback control system...?
Answer is (B) but again we should know why :


Negative feedback loops resist change by sensing a stimulus . For example, a negative feedback within the brain of a bird or mammal (Whale for example) a small region above the roof of the mouth called the hypothalamus is a biological thermostat. The hypothalamus has a genetically determined ideal temperature for body (e.g., in man about 37掳C or 98.6掳F), Specialized hypothalmic nerves measure the temperature of body through the brain while other nerves analyse arriving messages from temperature sensors in the skin (the hypothalamus then triggers the mechanisms of producing heat). When the temperature of the body drops below a certain point, the hypothalamus signals effectors, the muscles, to begin to contract. At first, of these contractions are small and occur at different times in different muscle. As the signal increases, muscle cells begin to fire messages in synchrony and the individual begins to shiver. These contractions generate heat and thus help to counteract the initial stimulus. If the environment is too cold body cannot keep up with heat loss, hypothermia may set in lowering the internal temperature is sensory confusion and ultimately leading to death. If, on the other hand, environmental temper ature is high, the individual can experience hyperthermia-high body temperature which can be damaging or even fatal.


While negative feedback loops resist internal change, positive feedback loops bring about rapid change.


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