The Placenta
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Questions and Answers

What is the main function of the placenta?

  • Regulating the body temperature of the fetus
  • Providing structural support to the umbilical cord
  • Producing red blood cells for the fetus
  • Facilitating nutrient, gas, and waste exchange between maternal and fetal circulations (correct)

    • In which organ does the placenta connect to the fetus?

  • Umbilical cord (correct)
  • Fetal liver
  • Fetal lung
  • Maternal uterus

    • What comes away with the placenta when it is expelled from the uterus following birth in humans?

  • Fetal bones
  • Fetal hair
  • Maternal decidual (endometrial) tissue (correct)
  • Maternal liver tissue

    • When did mammalian placentas probably first evolve?

    <p>About 150 million to 200 million years ago</p> Signup and view all the answers

    What is the protein syncytin found in the outer barrier of the placenta believed to have originated from?

    <p>An ancient retrovirus</p> Signup and view all the answers

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