Hormones that initiate pain messages and also cause muscle fibers in the uterine wall to contract (during labor) are ______.

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Prostaglandins are hormone-like substances that are produced by many tissues in the body, including the uterus. They are involved in a variety of physiological processes, including inflammation, blood clotting, and the initiation of pain messages. In the context of childbirth, prostaglandins are thought to play a role in both initiating labor and promoting the contractions of the uterine muscles.

Hormones That Initiate Pain Messages and Also Cause Muscle Fibers