Levels of oxytocin increase significantly during the ______ trimesters).

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Levels of oxytocin increase significantly during the third trimester, which is when contractions begin and labor occurs. Oxytocin plays a critical role in triggering and regulating contractions during childbirth. While oxytocin levels do increase during the first trimester, it is not as significant as the levels in the third trimester. The second trimester is characterized by fetal development and growth but not significant increases in oxytocin.

Levels of Oxytocin Increase Significantly During the ______ Trimesters)