DrG 29: 2 of 3 (Not MC)
the endoderm forms
the urinary bladder
during gastrulation
three germ layers are formed
the extraembryonic membrane that forms blood is the
yolk sac
a space opens within the inner cell mass that will form the
amniotic cavity
the mesoderm forms
muscle
ectoderm is to ____ as mesoderm is to _____
neural tissue; muscle tissue
the ectoderm forms
neural tissues
during implantation, the
syncytial trophoblast erodes a path through the endometrium
the solid ball of cells that has been likened to a mulberry is called a
morula
which of the following is one of the critical events of the first trimester
All of the above
under the influence of the trophoblast, maternal blood vessels in the endometrium
break down and form lacunae
the trophoblast has many of the characteristics of ___ cells
cancer
the mesoderm and trophoblast combine to form the
chorion
initially, the nutrients absorbed by the trophoblast easily reach the inner cell mass by simple
diffusion
the inner cell mass of the blastocyst will
form the embryo
by day 12 of embryonic development, mesoderm begins to form through
gastrulation
the placenta is a source of which of these hormones
hCG, relaxin, placental lactogen, and progesterone
a blastocyst is a
hollow ball of cells
all of the following are true of the allantois, except that
it acts as the fetal bone marrow
the region known as the primitive streak is the site of
migration of ectodermal cells to form the mesoderm