Which germ layer are the bones (except facial) derived from?
A. ectoderm
B. mesoderm
C. endoderm
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Question 2) Arrange the following in the sequence in which they form in the embryo. (1) neural plate (2) neural tube (3) notochord (4) primitive streak
A. 1, 2, 3, 4
B. 1, 3, 2, 4
C. 4, 3, 1, 2
D. 4, 1, 3, 2
E. 3, 4, 1, 2
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Question 3) The embryo is most sensitive to outside influences that can cause malformations during the
A. first two weeks after fertilization.
B. third to the ninth weeks of development.
C. ninth to the sixteenth weeks of development.
D. twelfth to the twentieth weeks of development.
E. twenty-first to twenty-sixth week of development.
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Question 4) Which germ layer is the epidermis derived from?
A. ectoderm
B. mesoderm
C. endoderm
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Question 5) Which germ layer is tooth enamel derived from?
A. ectoderm
B. mesoderm
C. endoderm
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Question 6) Which germ layer is the urinary bladder derived from?
A. ectoderm
B. mesoderm
C. endoderm
(
Question 7) Which germ layer is the cardiovascular system derived from?
A. ectoderm
B. mesoderm
C. endoderm
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Question 8) Which germ layer is the brain and spinal cord derived from?
A. ectoderm
B. mesoderm
C. endoderm
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Question 9) Which germ layer is most muscle derived from?
A. ectoderm
B. mesoderm
C. endoderm
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Question 10) Which germ layer is the thyroid derived from?
A. ectoderm
B. mesoderm
C. endoderm
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