1. Uterine Stretch Theory – a hollow organ such as the uterus when full, will empty
2. Oxygen Theory – oxytocin released by the posterior pituitary gland initiates labor.
3. Progesterone Deprivation Theory – contractions are initiated when progesterone levels are decreased as such at the end of pregnancy.
4. Prostaglandin Cascade Theory – labor is initiated due to the production of prostaglandin as a result of the interplay between adrenal, fetus, and uterus.
5. Aging Placenta Theory
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