College of Massage Therapists of British Columbia (CMTBC) Practice Exam

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What role does progesterone play during pregnancy?

Stimulates milk production
Regulates blood pressure
Thickens the lining of the uterus and maintains it during pregnancy
Promotes fetal growth

The correct answer is: Thickens the lining of the uterus and maintains it during pregnancy

Progesterone plays a crucial role during pregnancy primarily by thickening the lining of the uterus and maintaining it, which is essential for creating a suitable environment for the developing embryo. After conception, progesterone levels rise and help prepare the endometrium, making it more receptive to the implantation of the fertilized egg. This hormone also prevents contractions of the uterine muscles, which helps to maintain pregnancy and supports the growth and development of the fetus. While other hormones and processes are involved in fetal growth and milk production, progesterone's specific function in establishing and maintaining the uterine lining is vital to support early pregnancy. By ensuring that the uterine environment is stable and nourishing, progesterone is integral to the successful continuation of the pregnancy.