Embryology quiz
Embryology Mastery Quiz
Test your knowledge on the fascinating field of embryology with our comprehensive quiz! This quiz covers a wide range of topics, including implantation processes, hormonal fun
Whether you're a student, a teacher, or someone with a keen interest in embryology, this quiz is designed for you. Get ready to challenge yourself and deepen your understanding!
All of the following are directly involved with the implantation process except
Decidual reaction
Progesterone
Epiblast
invasion
none of the above
The seven-day blastocyst:
has a single layer of trophoblast at the embryonic pole
Has an amniotic cavity
is attached to the endometrial epithelium
Is surrounded by a degenerating zona pellucida
is called the hypoblast
Which of the following are classified as gonadotropin hormones?
FSH
GnRH
Estradiol or estrogen
Progesterone
All of the above
Haploid nuclei that fuse at fertilization are called:
Homunculi
Mitotic figures
centrioles
Nucleoli
Pronuclei
The first week of human development is characterized by formation of the:
inner cell mass
Hypoblast
trophoblast
Blastocyst
all of the above
During the follicular phase of the menstrual cycle:
FSH binds to the corpus luteum and stimulates estrogen production
FSH binds to granulosa cells of the follicle and stimulates estrogen production
FSH binds to the corpus luteum and stimulate progesterone production
FSH binds to granulosa cells of the follicle and stimulates progesterone production
FSH binds to granulosa cells of the follicle and stimulates LH production
Gonadotropin-releasing hormone or GnRH:
Acts on the hypothalamus, causing release of FSH & LH
is released once a month from the corpus luteum
Acts on anterior pituitary gland, causing release of FSH & LH
Acts on the anterior pituitary causing release of estrogen and progesterone
Is one of those meaningless substances that scientists play with in lieu of working for a livin
The LH surge:
Results in ovulation
Triggers resumption of meiosis within the oocyte
Is caused by a positive feedback effect of estrogen
all of the above
None of the above
The luteal/progestational/secretory phase of the menstrual cycle is characterized by:
high circulating levels of FSH and LH
High circulating levels of progesterone
An extreme variation in length from cycle to cycle
A thin, non-vascularized endometrium
None of the above
The second polar body:
Is released upon stimulation of the follicle by FSH
is released as a result of the LH surge
Is released after fertilization
is released after pronuclear formation
is also known as the south pole
The corpus luteum:
is only functional during the follicular phase of the menstrual cycle
has receptors for progesterone and estrogen
Is rescued from decline by hCG secreted by the implanted embryo
produces both FSH and LH
none of the above
During implantation, the blastocyst:
implants in the endometrium
Usually attaches to endometrial epithelium at its embryonic pole
Usually implants in the posterior wall of the body of the uterus
causes change in the endometrial tissues
All of the above are correct
Capacitation of the sperm:
is caused by the zona pellucida
Occurs in the male
prevents polyspermy
Is essential for fertilization
Removes the head of the sperm
The most significant factors in sperm transport to the vicinity of the oocyte is:
sperm flagellum (tail)
sperm flagellum (tail)
an intact zona pellucida
an intact zona pellucida
an intact zona pellucida
The early stages of cleavage are characterized by:
Formation of a hollow ball of cells
formation of the zona pellucida
increase in the size of the cells in the zygote
increase in the number of cells in the zygote
none of the above
The most common site for implantation in ectopic pregnancy is:
internal os of the uterus
Mesentery
ovary
Uterine tube
Other
During the morula stage:
Tight junctions appear between peripheral cells, isolating the inner cells from uterine fluid
the location of the cells dictates their fate
The outer cells pump fluid, creating a fluid- filled blastocoele
attachment to the uterine epithelium has not yet occurred
All of the above are correct
Capacitation of spermatozoa is an activation process that involves changes in the surface coat and plasma membrane over the _______
tail
body
Neck
Acrosome
Nucleus
Implantation will not take place unless the zona _________ is lost.
Pellucida
Limitans
orbicularis
corona
oophorus
Before a spermatozoan can fertilize an ovum:
The cell membrane is removed from the spermatozoan head
The zona pellucida must be shed
The acrosomal membrane must perforate
The tailpiece is lost
the decidua reaction must occur
At fertilization:
The haploid number of chromosomes is restored
The chromosomal sex is determined
cleavage is inhibited
The inner cell mass becomes recognizable
The ovum becomes the blastocyst
Which of the following events are directly related to implantation?
Interaction between uterine endometrium and hypoblast
release of proteolytic enzymes
loss of the decidua
Acrosome reaction
capacitation
In ectopic pregnancy:
the placenta overbridges the internal os of the uterus
Implantation is inside the uterus
severe bleeding is present during vaginal delivery
the most common site is the uterine tube
Approximately how many million sperm are there in the average ejaculate of 3.5 cc?
5
50
100
200
More than 200
The meeting and union of human sex cells is believed to occur in the:
upper third of the uterine tube
Middle third of the uterine tube
lower third of the uterine tube
uterus
Cervix
Sexuality is established at the time of:
Sexuality is established at the time of:
Gametogenesis
histogenesis
morphogenesis
None of the above
Cleavage divisions are always:
meiotic
Mitotic
Amniotic
anucleotic
By binary fission
At which of the following stages of development is division of embryonic material likely to result in normal monozygotic twinning?
2-cell stage
morula
Blastocyst
Implanting embryo
All of the above
Ectopic implantations occur most commonly in the:
Ovary
Abdomen
Uterine tube
Cervix
posterior wall of the uterus
With the light microscope, the zona pellucida appears as a translucent membrane surrounding the:
Primary oocyte
Zygote
morula
Very early blastocyst
All of the above are correct
The fifth day of human development is characterized by embryonic cells of the:
inner cell mass
embryonic hypoblast
epiblast
primitive streak
primitive streak
The _______ is/are part(s) of the 4-day blastocyst
Syncytiotrophoblast
blastocyst cavity
notochord
Somitomeres
It is approximately correct to compute the age of an embryo from the fourteenth day after:
Onset of last menstruation
Last sexual intercourse
last full moon
Last missed menstrual period
Onset of breast changes
Why do all mitochondria DNA of the embryo come from the mother?
Sperm do not contain mitochondria
Head and tail of sperm degrade upon fertilization
Cell division process leaves out mitochondria DNA from sperm
Mitochondrial DNA of sperm is degraded upon entering egg
At the 32-cell stage of division, the embryo is known as a morula that contains inner cell mass and outer cell mass. What do the inner and outer cell masses eventually become?
Placenta / embryo and fetus
Embryo and fetus / placenta
Chorionic membrane / amniotic membrane
Amniotic membrane / chorionic membrane
Where is the normal location of initial implantation of the embryo?
Posterior superior wall of uterus
Anterior posterior wall of uterus
Lateral superior wall of uterus
Medial posterior wall of uterus
Ampulla of uterine tube
What two layers does the trophoblast differentiate into once attached to the uterine lining?
Zona pellucida / corona radiata
Cytotrophoblast / syncytiotrophoblast
Endoderm / ectoderm
Ectoderm/ mesoderm
Blastocyst / embryoblast
Implantation of the embryo in the lower uterus can cause what medical condition that may lead to hemorrhage, fetal insufficiency, and even death for both mother and baby due to obstruction of the birth canal?
Plaenta abortio
Placenta previa
Placenta divisum
Placenta increta
The completion of interstitial implantation, so that the conceptus is entirely within the endometrium, occurs:
On about day 20
By about day 11
by the end of the first week
By erosion of the myometrial lining
As a result of endodermal proliferation
Both the neurenteric canal and the notochordal plate are present in the conceptus at the same time.
true
False
The amniotic cavity develops:
on the tenth day
Within the outer cell mass
Within the inner cell mass near the cytotrophoblast
in extraembryonic mesoderm
None of the above
During the second week of development, the trophoblast differentiates into:
Syncytiotrophoblast
Ectoderm
intraembryonic mesoderm
yolk sac (secondary)
Major events beginning in the second week of development include:
Notochord differentiation
Somite formation
Angiogenesis
Yolk sac development
The first two intraembryonic germ layers to differentiate are the:
Ectoderm & hypoblast
epiblast & hypoblast
ectoderm & endoderm
Ectoderm & mesoderm
The blastocoele becomes the:
amniotic cavity
Extraembryonic coelom
primary yolk sac
Chorionic cavity
Secondary cavity
Extraembryonic somatic mesoderm is in close association with:
Syncytiotrophoblast
Cytotrophoblast and amnion yolk sac
Syncytio- & cytotrophoblast
Yolk sac
Cytotrophoblast cells become:
secondary yolk sac
Amnioblasts
exocoelomic membrane
Syncytiotrophoblast
The yolk sac in the human embryo:
does not contribute to the embryonic gut
Is devoid of hemopoietic activity, or blood cell formation
is the site of primordial germ cell production
Stores nutrients throughout pregnancy
The bilaminar germ disc:
Consists of epiblast and mesoblast
Is derived from the outer cells of the morula
Forms the embryo proper
synthesizes human chorionic gonadotropin, HCG
The definitive yolk sac of the embryo appears by what day?
13th
26th
72nd
94th
2nd
The amniotic cavity appears as a slit-like space near the embryonic polar trophoblast and within the:
Extraembryonic mesoderm
Exocoelomic membrane
inner cell mass
Connecting body stalk
Cytotrophoblast
During the second week, the embryonic disk is composed of:
ectoderm
Ectoderm and mesoderm
endoderm
Epiblast and hypoblast
Ectoderm, mesoderm and endoderm
The part of the 13-day embryoblast from which the embryo proper is formed:
Lies between the amniotic cavity and yolk sac
Also contributes to the roof of the yolk sac
Is composed of two primary germ layers
Is composed of two primary germ layers
All of the above are correct
The cloacal membrane consists of:
Embryonic endoderm, mesoderm and ectoderm
a spherical area of endoderm fused to embryonic mesoderm
the prochordal plate and the overlying embryonic endoderm
None of the above
endoderm of the roof of the yolk sac and embryonic ectoderm
The amniotic cavity develops:
On the 10th day
On the 10th day
between inner cell mass and trophoblast
In the extraembryonic mesoderm
Between two layers of cytotrophoblast
Which statement about the 14-day blastocyst is NOT true?
villi are absent
Extraembryonic coelom surrounds the yolk sac
primitive uteroplacental circulation is established
Extraembryonic mesoderm is split into two layers
None of the above
Which layer invades into the maternal endometrium and forms the lacunar network for placental-maternal exchange?
blastocyst
Cytotrophoblast
syncytiotrophoblast
endoderm
Ectoderm
Mesoderm
Which layer is acellular, does not expand mitotically, and produces human chorionic gonadotropin (hCG) which stimulates progesterone production by the corpus luteum?
syncytiotrophoblast
Cytotrophoblast
Epiblast
Endoderm
ectoderm
Mesoderm
Which layer is cellular and expands mitotically into syncytiotrophoblast to form primary chorionic villi that can be used in chorionic villus sampling or genetic testing for the early fetus?
Syncytiotrophoblast
Cytotrophoblast
Epiblast
endoderm
Ectoderm
Mesoderm
What malignant tumor arises from trophoblastic cells?
Liposarcoma
Rhabdomyosarcoma
Fibroma
Choriocarcinoma
Endometrioma
How does a hydatidiform mole occur?
Hyperplastic proliferation of trophoblast within the uterine wall
Malignant transformation of endometrial cells
Malignant transformation of ovarian cells
Malignant transformation of ovarian cells
Malignant proliferation of blastocyst
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