The hormonal control of birth

Towards the end of pregnancy, the levels of estrogen in the blood rise while that of progesterone falls. It has been suggested that this plays some part in bringing about birth. Indeed, estrogen promotes uterine contraction whereas progesterone doesn’t. But the most direct cause of birth in another hormone, oxytocin secreted by the posterior lobe of the pituitary gland that causes uterine muscle contraction. Oestrogen and progesterone are also responsible for the growth of the mammary gland in preparation for milk production (lactation). After birth, milk flow is initiated by a hormone called prolactin secreted by the anterior lobe of the pituitary gland. Please find free downloadable notes, exams and marking guides of agriculture, biology, Physics, chemistry etc.  from digitalteachers.co.ug website. Dr. Bbosa Science