BIO 100 - Chapter 21 Development & Aging

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tt23
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272506
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BIO 100 - Chapter 21 Development & Aging
Updated:
2014-04-30 07:08:07
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Exam4
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  1. Fertilization is completed when the sperm nucleus fuses with the ________.
    egg nucleus
  2. The cell formed by the union of egg and sperm during fertilization is the ________.
    zygote
  3. Following fertilization, if a ball of embryonic cells divides into two masses before differentiation has begun, ________ twins result.
    identical
  4. For sperm to be able to penetrate the zona pellucida of the egg, enzymes are released from the ________.
    acrosome
  5. The process of a cell going from an unspecialized function to a specialized function is called ________.
    differentiation
  6. The formation of the ________ cavity and the differentiation of the embryonic disk into ectoderm and endoderm occurs at the end of the pre-embryonic period of development.
    amniotic
  7. As cell division continues, the 32 cell ________ develops into the blastocyst.
    morula
  8. The first three tissues to form in the embryo, called germ layers, are the ________, ________, and ________.
    • ectoderm
    • mesoderm
    • endoderm
  9. The ________ becomes the blood vessels in the umbilical cord.
    allantois
  10. The extra-embryonic membrane known as the _______ is the source of germ cells that eventually develop into gametes.
    yolk sac
  11. In order for testes and testosterone to be produced the ________ gene must be present on the Y chromosome.
    SRY
  12. During labor, full dilation of the cervix signifies the end of the ________ stage.
    dilation
  13. Ejection of milk from the breasts is caused by the hormone ________.
    oxytocin
  14. The period of childhood development that occurs during the first month of life is called the ________ period.
    neonatal
  15. The important organ systems, that causes death if they fail, are the brain, the cardiovascular system and the ________ system.
    respiratory

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