Under the influence of the trophoblast, maternal blood vessels in the endometrium
A) disappear.
B) attach to the inner cell mass.
C) break down and form sinuses or lacunae.
D) form a capillary network in the trophoblast.
E) increase in size and penetrate the blastocyst.
Correct Answer:
Verified
Q30: A blastocyst is a(n)
A) extraembryonic membrane.
B) solid
Q31: During gastrulation,
A) the blastomeres fuse.
B) the placenta
Q32: The region known as the primitive streak
Q33: During early development, the Y chromosome produces
Q34: The extraembryonic membrane that forms blood is
Q36: Which of the following is false concerning
Q37: The solid ball of cells that has
Q38: The ectoderm forms
A) muscle.
B) blood.
C) neural tissues.
D)
Q39: The penetration of the endometrium by the
Q40: The mesoderm forms
A) muscle.
B) epidermis.
C) the brain.
D)
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