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Parturition Process

Parturition Process 1. Parturition is the birth process which is accompanied with labor pains .   2. It is a neuro - endocrine mechanism which involves rise in estrogen : progesterone ratio and increase in oxytocin receptors in myometrium of uterine wall .   3. The fully developed foetus gives signals for the uterine contractions by secreting Adrenocorticotropic hormone ( ACTH ) from pituitary and corticosteroids from adrenal gland .   4. This triggers release of oxytocin from mother's pituitary gland , which acts on uterine muscles of mother and causes vigorous uterine contractions .   5. This leads to expulsion of the baby from the uterus .   6. Parturition involves three stages, viz. Dilation stage, expulsion stage and after birth or placental stage. Oxytocin During and after delivery of a baby, oxytocin affects two target tissues: the mother’s uterus and breasts. During delivery, stretching of the cervix of the uterus stimulates the ...