青春发育早期的身心变化与自我保健 并非神秘—月经 Hypothalamus Pituitary Ovaries Figure 14-1 How puberty may begin.Research on female mice suggests the following scenario:At puberty,fat cells multiply and secrete a protein called leptin,which travels in the bloodstream to the brain.When the concentration of leptin is high enough,the hypothalamus sends out hormonal signals to the pituitary gland,telling it to release its own hormones, which then travel through the bloodstream to the In her diary,Anne Frank ovaries.The ovaries then activate and release expressed the ambivalence estrogen,the hormone that stimulates breast growth about menstruation felt by many and other changes of puberty.Studies have not yet been done to determine whether a similar process young girls,describing it as a may occur in males. nuisance but also as a "sweet Source:Dr.Melvin M.Crumbach,1997. secret."并非神秘——月经 青春发育早期的身心变化与自我保健