Reproductive glands of endocrine system release sex hormones to keep the male and female reproductive systems properly. The (1) _____________ of male which lie in the scrotum, secretes hormones called (2) ________________; the most important of which is testosterone. These hormones are secreted that affect many male characteristics such as development of the secondary sexual characteristics like the growth of hair in various body parts as well as (3) ______________ production. On the other hand, the (4) ________________ of the female produce estrogen and (5) _________________________. These hormones cause the development of female sexual characteristics like breast enlargement and in the regulation and maintenance of menstruation and pregnancy, respectively.​