During the embryonic stage,the primary germ layers develop from the
A) placentA.
B) blastocyst.
C) embryonic disC.
D) morula.
Correct Answer:
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Q30: A major difference between fetal blood flow
Q33: As a result of the foramen ovale,blood
Q33: The placenta is composed of tissues from
Q35: Which of the following is (are) true
Q36: The fetal blood that passes through the
Q38: The major body parts derived from endoderm
Q40: Teratogens are substances that
A)stimulate embryonic growth.
B)cause congenital
Q47: The major body parts derived from mesoderm
Q51: The placenta allows
A)oxygen and nutrients to diffuse
Q53: The implantation of the blastocyst results from
A)enzymes
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