Human Embryonic Development
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Questions and Answers

What is the primary function of the amnion?

  • To transport nutrients and oxygen between the embryo and trophoblast
  • To form the urinary bladder
  • To produce and contain the yolk sac
  • To produce and contain the amniotic fluid (correct)

    • Which membrane is the first to appear during embryonic development?

  • Allantois
  • Yolk sac (correct)
  • Amnion
  • Chorion

    • What is the main function of the chorion?

  • To produce blood cells
  • To transport nutrients and oxygen between the embryo and trophoblast (correct)
  • To produce and contain the amniotic fluid
  • To form the urinary bladder

    • Which membrane is responsible for forming the urinary bladder?

    <p>Allantois</p> Signup and view all the answers

    What is the relationship between the chorion and the placenta?

    <p>The placenta is formed from the chorion</p> Signup and view all the answers

    When does the placenta take over the production of progesterone from the corpus luteum?

    <p>Between the 1st and 2nd trimester</p> Signup and view all the answers

    What is the role of the liver in blood cell formation?

    <p>It develops blood cells and then migrates to the bone marrow</p> Signup and view all the answers

    What is the part of the endometrium that remains attached to the placenta?

    <p>Decidua basalis</p> Signup and view all the answers

    What is the condition where the placenta is implanted very low, which means the placenta has to come out first during delivery?

    <p>Placenta previa</p> Signup and view all the answers

    What is the function of the umbilical artery?

    <p>To carry deoxygenated blood from the baby to the placenta</p> Signup and view all the answers

    What is the hormone produced by the placenta that helps maintain the corpus luteum during the first three months of pregnancy?

    <p>Human Chorionic Gonadotropin (HCG)</p> Signup and view all the answers

    What is the part of the endometrium that surrounds the free-floating chorion membrane?

    <p>Decidua capsularis</p> Signup and view all the answers

    What is the consequence of placenta previa?

    <p>Requires a C-section</p> Signup and view all the answers

    What is the function of hyaluronic acid produced by the syncytial trophoblast?

    <p>Breaks down the endometrial membrane, allowing the embryo to burrow in</p> Signup and view all the answers

    What is the function of the placenta?

    <p>To supply the fetus with oxygen and nutrients</p> Signup and view all the answers

    What is the term for the process of the embryo burrowing into the endometrium?

    <p>Implantation</p> Signup and view all the answers

    What is the outermost layer of the blastodisc called?

    <p>Trophoblast</p> Signup and view all the answers

    What is the purpose of the syncytial trophoblast?

    <p>To produce hyaluronic acid and facilitate implantation</p> Signup and view all the answers

    What is the term for the formation of the 3 layers of the blastodisc?

    <p>Gastrulation</p> Signup and view all the answers

    What is the role of the epiblast in gastrulation?

    <p>It migrates to the primitive streak to form the 3 germ layers</p> Signup and view all the answers

    What is the term for the layer that develops into the nervous system?

    <p>Ectoderm</p> Signup and view all the answers

    What is the term for the process of cell division that produces sibling cells with half the haploid number of chromosomes?

    <p>Meiosis</p> Signup and view all the answers

    What is the term for the joining of two gametes to form a zygote?

    <p>Fertilization</p> Signup and view all the answers

    How many chromosomes are present in a zygote?

    <p>46</p> Signup and view all the answers

    What is the term for the adhesion of the blastocyst to the uterine cell wall?

    <p>Implantation</p> Signup and view all the answers

    What is the term for the sequence of divisions that ends with contact with the uterine wall?

    <p>Cleavage</p> Signup and view all the answers

    What is the term for the type of twin that forms when a single fertilized egg breaks apart and develops into two separate zygotes?

    <p>Monozygotic</p> Signup and view all the answers

    Where does fertilization typically occur?

    <p>Fallopian tube</p> Signup and view all the answers

    What is the consequence if no implantation occurs?

    <p>No HCG is produced and pregnancy is not confirmed</p> Signup and view all the answers

    What is the purpose of detecting HCG?

    <p>To confirm pregnancy</p> Signup and view all the answers

    What is the significance of the cervical canal during labor?

    <p>It allows for fetal passage during delivery</p> Signup and view all the answers

    What is the function of effacement during labor?

    <p>It thins the uterine lining</p> Signup and view all the answers

    What is the primary function of prostaglandins in labor?

    <p>They stimulate smooth muscle contraction</p> Signup and view all the answers

    What is the role of oxytocin in labor?

    <p>It stimulates uterine contractions</p> Signup and view all the answers

    What is the function of relaxin in fetal development?

    <p>It softens the pelvic ligaments</p> Signup and view all the answers

    What is the typical duration of the placental stage of labor?

    <p>20-40 minutes</p> Signup and view all the answers

    What is the term for the expulsion of the fetus?

    <p>Parturition</p> Signup and view all the answers

    What is the consequence of pushing too early during labor?

    <p>The opening swells with rebound closure</p> Signup and view all the answers

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