Which Steroid Hormone Does Not Cross the Placenta and Why?

Discover why progesterone is the steroid hormone that does not cross the placenta and its vital role during pregnancy.

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Progesterone is the steroid that does not cross the placenta. Progesterone plays a crucial role during pregnancy, mainly produced by the corpus luteum and later by the placenta itself, it helps maintain the uterine lining for a fertilized egg to implant and helps keep the pregnancy. Since it is synthesized by the placenta, there's no need for it to cross from the maternal circulation into the fetal circulation.

FAQs & Answers

  1. What steroid hormones cross the placenta? Steroid hormones like estrogen and cortisol can cross the placenta, whereas progesterone does not because it is synthesized by the placenta itself and mainly acts locally.
  2. Why does progesterone not need to cross the placenta? Progesterone does not cross the placenta because it is directly produced by the placenta and corpus luteum to maintain pregnancy, eliminating the need for transfer from maternal blood to the fetus.
  3. What is the role of progesterone during pregnancy? Progesterone helps maintain the uterine lining, supports implantation of the fertilized egg, and prevents uterine contractions to sustain a healthy pregnancy.

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For more insights on pregnancy hormones and their functions, explore our related videos on placental hormone synthesis, the role of estrogen during pregnancy, and fetal-maternal hormone signaling.

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