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Which of these is not an important component of initiation of parturition in humans?

1. Synthesis of prostaglandins
2. Release of oxytocin
3. Release of prolactin
4. Increase in estrogen and progesterone ratio

Correct answer: Release of prolactin

Solution

Prolactin is mainly involved in milk production after delivery, not in initiating labor. Parturition is driven by increased prostaglandins, oxytocin-mediated contractions, and a higher estrogen-to-progesterone ratio.

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