Pregnancy and Lactation Physiology · Physiology

Progesterone during pregnancy helps prevent preterm labor by:

  1. Stimulating the release of oxytocin near term
  2. Reducing uterine muscle excitability
  3. Increasing prostaglandin synthesis in the myometrium
  4. Strongly enhancing the action of estrogen
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Correct answer: Reducing uterine muscle excitability

Progesterone reduces myometrial excitability and suppresses contractions. This maintains uterine quiescence.

Difficulty: Medium Question 14 of 20

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