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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