North American Registry of Midwives (NARM) Practice Exam 2026 – The All-in-One Resource to Master Your Midwifery Certification!

The hormone responsible for relaxing the uterus and blood vessel walls during pregnancy is progesterone. This hormone plays a crucial role in maintaining pregnancy by preparing the uterine lining for implantation and reducing uterine contractions, which helps to prevent premature labor. Progesterone promotes the relaxation of smooth muscle tissues, including those in the uterus and blood vessels, which is vital for accommodating the growing fetus and ensuring adequate blood flow to support the pregnancy.

Understanding the function of progesterone is essential for midwives, as it helps them monitor and manage the various physiological changes that occur during pregnancy. This includes recognizing how hormonal fluctuations influence uterine tone and vascular resistance, which are critical for maternal and fetal health throughout gestation.