North American Registry of Midwives (NARM) Practice Exam

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Prepare for the North American Registry of Midwives Exam. Utilize flashcards and multiple choice questions, each with hints and explanations. Get ready to excel!

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What two mechanisms are responsible for placental separation?

Hormonal changes and uterine contractions
Uterine contractions and abrupt decrease in the uterine cavity size
Fetal movement and maternal blood flow
Elevation of the cervix and vaginal pressure

The correct answer is: Uterine contractions and abrupt decrease in the uterine cavity size

The correct choice regarding the mechanisms responsible for placental separation is rooted in the physiological processes occurring during the third stage of labor. Uterine contractions play a critical role in facilitating placental separation by exerting pressure against the placenta, which aids in detaching it from the uterine wall. Additionally, the abrupt decrease in the uterine cavity size is significant as it occurs when the baby is born, causing the uterus to contract and effectively reduce its volume. This reduction supports the process of separation by creating a dynamic change in pressure that encourages the placenta to detach from its implantation site. In summary, both the powerful uterine contractions and the rapid decrease in uterine cavity size work in tandem to ensure that the placenta is expelled effectively and efficiently after the delivery of the baby. This understanding highlights the importance of monitoring uterine tone and contractions during the third stage of labor in midwifery practice.