27.2 Pre-embryonic Period Flashcards
Fertilization is the fusion of a sperm cell and secondary oocyte to form a _____.
Fertilization is the fusion of a sperm cell and secondary oocyte to form a zygote.
Sperm must migrate to the oocyte, undergo capacitation, and penetrate the corona radiata and zona pellucida to successfully fertilize an oocyte.
Which part of the embryo contributes to the fetal portion of the placenta?
hypoblast
trophoblast
inner cell mass
epiblast
Which part of the embryo contributes to the fetal portion of the placenta?
hypoblast
trophoblast
inner cell mass
epiblast
Which of the following is NOT a function of amniotic fluid?
provides nutrition for the developing embryo
protects the embryo from trauma
maintains a constant temperature for the developing embryo
allows the embryo freedom of movement
Which of the following is NOT a function of amniotic fluid?
provides nutrition for the developing embryo
protects the embryo from trauma
maintains a constant temperature for the developing embryo
allows the embryo freedom of movement
The fusion of a sperm cell and secondary oocyte is known as:
meiosis.
ovulation.
fertilization.
capacitation.
The fusion of a sperm cell and secondary oocyte is known as:
meiosis.
ovulation.
fertilization.
capacitation.
The 16-cell stage is known as the:
blastocyst.
morula.
trophoblast.
blastomere.
The 16-cell stage is known as the:
blastocyst.
morula.
trophoblast.
blastomere.
In humans, from which extraembryonic membrane will the first blood cells arise?
chorion
amnion
yolk sac
allantois
In humans, from which extraembryonic membrane will the first blood cells arise?
chorion
amnion
yolk sac
allantois
The _____________ forms the embryo and the extraembryonic membranes )including the amnion, yolk sac, allantois, and chorio)
The inner cell mass forms the embryo and the extraembryonic membranes )including the amnion, yolk sac, allantois, and chorio)
The zygote undergoes cleavage to become a blastocyst, which differentiates into the _______ and _________.
The zygote undergoes cleavage to become a blastocyst, which differentiates into the trophoblast and an inner cell mass.
The layers of the trophoblast produce _______________ and digest the uterine lining into which the blastocyst implants.
The layers of the trophoblast produce human chorionic gonadotropin (hCG) and digest the uterine lining into which the blastocyst implants.
hCG stimulates the ________ to secrete _________and _________and promotes placental development.
hCG stimulates the corpus luteum to secrete estrogen and progesterone and promotes placental development.
