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Embryonic Development (Weeks 3-8) quiz

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  • Which organ develops and is fully functional in the first trimester?
    The heart is one of the first organs to develop and becomes functional during the first trimester.
  • What developmental event occurs during the second trimester?
    Rapid growth and further development of organ systems
  • What developmental event occurs during the embryonic period?
    Formation of the neural tube
  • Which structure of the amniotic egg most closely surrounds the embryo?
    The amnion is the structure that most closely surrounds the embryo.
  • Which of these statements regarding the embryo is false? A) The embryo has all organ systems recognizable by the end of week 8 B) The embryo is fully developed by the end of the first trimester C) The embryo undergoes gastrulation to form three germ layers D) The embryo's heart begins to beat during the embryonic period
    B) The embryo is fully developed by the end of the first trimester
  • At what week of development does the differentiation of the external genitalia begin?
    Differentiation of the external genitalia begins around week 9 of development.
  • Which of these characteristics is the same in amniotic eggs and placental mammal eggs? A) Presence of a yolk sac B) Direct nourishment from the mother C) External development D) Lack of a protective shell
    A) Presence of a yolk sac
  • During which trimester does neurulation occur?
    First trimester
  • Which embryonic structure is derived from the ectoderm?
    Nervous system
  • What occurs during gastrulation?
    Gastrulation transforms the bilaminar embryonic disc into a trilaminar disc with three germ layers: endoderm, mesoderm, and ectoderm.
  • What occurs during gastrulation in prenatal development?
    The embryo forms three germ layers
  • At what point during development does the embryo form three germ layers?
    The embryo forms three germ layers during gastrulation, which occurs around days 12-16 post conception.
  • What is the characteristic of the gastrula stage of embryo development?
    The gastrula stage is characterized by the formation of three germ layers: endoderm, mesoderm, and ectoderm.
  • During which stage of development do the primary germ layers form?
    The primary germ layers form during the gastrulation stage of development.
  • Why does organogenesis begin with neurulation?
    Organogenesis begins with neurulation because it is the first major event in the specialization of the ectoderm, leading to the development of the central nervous system.