Males and females show difference in the age of onset of pubey. The difference in the age of onset of pubey amongst males may be explained by:
C i.e. Increased inhibin levelsDelayed onset of pubey in boys in due to increased production of inhibinQ, which results in greater negative feedback on FSH as compared to girls.Onset of pubeyPubey begins earlier in girls. Because both sexes show a similar increase in GnRH and LH at the onset of pubey, whereas FSH secretion shows sexual diamorphism i.e., its secretion varies between both sexes in childhood & early pubey. It has been suggested that differences in the timing of onset of pubey b/w both sexes is due to differences in FSH seretionQ.FSH secretion is under regulation of FSH regulatory peptides (& GnRH). So the FSH regulatory peptides which stimulate FSH secretion cause early onset of pubey whereas pubey is delayed by peptides that inhibit FSH secretionQ. FSH - regulatory peptide
Increased Activin - A levels
Decreased Follistatin levels
Increased Inhibin levels
Easily releasable FSH pool