The endocrine system is one the system in the human body that regulates all the hormones which aids in the normal functioning of the other systems. Therefore, the major functions of the endocrine system include metabolism, and puberty body. Hope this answers your question.
Answer: Prolactin
Explanation:
By the 5-6 month of pregnancy the breasts becomes ready to produce milk or colostrum. During the late stages of pregnancy, the women breast enter into the lactogenesis first stage. The level of prolactin rises. After birth the prolactin levels remains high the breast is stimulated. The release of prolactin triggers the cells present in the alveoli of the breast to secrete milk.