Biology Forums - Study Force

What is the approximate duration of the fetal period of development?
 
  A. 4 weeks
  B. 12 weeks
  C. 29 weeks
  D. 39 weeks

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(Question 2) Teratogens are most damaging to organ systems if exposure to them occurs
 
  A. early in pre-embryonic development.
  B. when the organ systems are undergoing peak development in the embryo.
  C. in the fetal period, after systems have formed but have not completed maturation.

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(Question 3) Lateral plate mesoderm gives rise to most of the components of the cardiovascular system.
 
  Indicate whether this statement is true or false.

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(Question 4) Drugs that lead to birth defects in the formation of the limbs are most damaging when the conceptus is exposed to them during weeks
 
  A. 1-2 of development, before the placenta is fully formed.
  B. 4-8 of development, when limbs are undergoing peak development.
  C. 12-16 of development, when limbs have formed but are not fully mature.
  D. 24-28 of development, when plasticity of surrounding tissues has been lost.

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(Question 5) Which part of the embryo develops into the kidneys?
 
  A. Endoderm
  B. Paraxial mesoderm
  C. Notochord
  D. Intermediate mesoderm

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(Question 6) Blocklike masses that form from paraxial mesoderm and develop into muscle, axial skeleton, cartilage, and dermis are known as __________.
 
  Fill in the blank with correct word.

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(Question 7) Neurulation is the development of the nervous system from the
 
  A. endoderm.
  B. mesoderm.
  C. ectoderm.
  D. hypoderm.

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(Question 8) The future head and buttocks regions of the embryo are facilitated by the process of _____________ folding.
 
  A. cleavage
  B. cephalocaudal
  C. transverse
  D. amitotic
  E. chorionic

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(Question 9) The structure of the mesoderm that induces formation of the neural tube is the
 
  A. head mesenchyme.
  B. amnion.
  C. notochord.
  D. paraxial mesoderm.

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(Question 10) The process that involves the fusion of the two sides of the embryonic disc at a newly formed midline, thereby creating a cylindrical embryo is __________ folding.
 
  A. invagination
  B. cephalocaudal
  C. transverse
  D. amphiamniotic
  E. coronal

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