Please give me the answer to the A-level Biology Question If the concentration of testosterone in a man’s blood starts to rise above normal, this system leads to a reduction in testosterone. How does this occur?
A-level Biology Help >>>>> If the level of testosterone in blood of a man starts to exceed the norm the system results in the reduction of testosterone. What is the cause? | Students are aware of the Hyothalamus-pituitary axis (HPA axis) in the female, but are not as aware about the role of the HPA axis in the male reproductive system. We should begin by describing the normal HPA axis. The hypothalamus produces GnRH that stimulates pituitary glands to discharge LH and FSH which stimulates glands in the pituitary to secrete testosterone. This is an illustration of a positive feedback loop. When testosterone levels rise in the blood, it hinders GnRH release through the hypothalamus.This results in there is less LH in addition to FSH can be released by the pituitary (the pituitary itself is also likely to be affected) so testosterone isn't stimulated by the testes that produces testosterone. This is an illustration of negative feedback loops.
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