Bio 2.2 Lab Exam 4: Embryology I

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Bio 2.2 Lab Exam 4: Embryology I
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2013-05-07 02:21:00
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  1. Where does spermatogenesis occur?
    In the seminiferous tubule within the testes.
  2. What receptors do Sertoli cells have?
    • Follicle Stimulating Hormone (FSH)
    • Testosterone
  3. What do interstitial cells secrete?
    Testosterone
  4. What is the hormone cascade that results in the release of testosterone?
    • Hypothalamus secretes GnRH.
    • LH is released by the pituitary gland.
    • Testosterone is released by interstitial cells.
  5. Where does oogenesis occur?
    The ovary.
  6. What are the support cells of oocytes?
    Granulosa cells
  7. What is a follicle?
    An oocyte surrounded by support cells.
  8. What does FSH trigger in oogenesis?
    The development of ovarian follicles.
  9. What does LH trigger in oogenesis?
    The release of an oocyte from the ovary.
  10. Name this structure.
    Primary Follicle
  11. Name this structure.
    Secondary Follicle
  12. Name this structure.
    Mature Follicle
  13. Name this structure.
    Corpus Lutea
  14. What type of cleavage is this and what is the name of the developmental stage?
    • Spiral Cleavage
    • Morula
  15. What type of cleavage is this and what is the name of the developmental stage?
    • Radial Cleavage
    • Morula
  16. What is the difference between spiral and radial cleavage?
    • In spiral cleavage the upper and lower blastomeres sit at 45 degrees to each other.
    • In radial cleavage the they sit on top of each other.
  17. Who typically has spiral cleavage?
    • Annelid worms
    • Mollusks
    • Arthropods
  18. Who typically has radial cleavage?
    • Chordates
    • Echinoderms
  19. As morula division continues, what do blastomeres on the inside of the blastula secrete and what does this cause?
    • They secrete Na which causes water to rush into the cavity osmotically.
    • This causes the formation of the blastocoel.
  20. At what stage in development do the germ layers appear?
    The gastrula stage.
  21. What does the endoderm form?
    The lining of the but and respiratory system.
  22. What does the ectoderm form?
    The skin and nervous system.
  23. What does the mesoderm form?
    Everything but the nervous system, skin, gut and respiratory system.
  24. What do the coelomic vesicles form?
    Mesoderm
  25. What germ layer is the archenteron?
    Endoderm
  26. If an organism shows spiral cleavage, will the opening of the archenteron form the mouth or the anus?
    Mouth
  27. What does it mean to be protostomic?
    During cleavage the mouth is formed first.
  28. If an organism shows radial cleavage, will the opening of the archenteron form the mouth or the anus?
    Anus
  29. What does it mean to be deuterostomic?
    During cleavage the anus is formed first.
  30. What stage of development is this?


    Gastrula
  31. What stage of development is this and what is the open cavity called?
    • Blastula
    • Blastocoel
  32. What is organogenesis?
    The development of organs in an embryo.
  33. What stage of development is this?

    Embryo

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