Parturition is the process of giving birth — the expulsion of the fully developed fetus from the uterus at the end of pregnancy. It marks the end of gestation and the beginning of extra-uterine life for the baby.

Hormones Involved in Induction of Parturition:
Oxytocin

Secreted by: Posterior pituitary gland

Function: Stimulates strong uterine contractions to push the baby out during labor.

Relaxin

Secreted by: Ovary and placenta

Function: Relaxes pelvic ligaments and softens the cervix to facilitate delivery.

Prostaglandins

Secreted by: Placenta and uterine tissues

Function: Enhance uterine contractions and help in cervical dilation.

Estrogens

Function: Increase the sensitivity of the uterus to oxytocin, preparing it for labor.

Cortisol (from the fetus)

Function: Matures fetal organs and plays a role in initiating the hormonal cascade for labor.