OB Final Exam NCLEX with Complete Solutions | Already Passed
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Course
Nclex
Institution
Nclex
OB Final Exam NCLEX with Complete
Solutions | Already Passed
An expectant father asks the nurse, "Which part of the mature sperm
contains the male chromosome?" What is the correct response by the
nurse?
a. X-bearing sperm
b. The tail of the sperm
c. The head of the sperm
d. The middle porti...
An expectant father asks the nurse, "Which part of the mature sperm
contains the male chromosome?" What is the correct response by the
nurse?
a. X-bearing sperm
b. The tail of the sperm
c. The head of the sperm
d. The middle portion of the sperm -✔✔ ANS: C
The head of the sperm contains the male chromosomes that will join the
chromosomes of the ovum. If an X-bearing sperm fertilizes the ovum, the
baby will be female. The tail of the sperm helps propel the sperm toward
the ovum. The middle portion of the sperm supplies energy for the tail's
whip-like action.
One of the assessments performed in the birth room is checking the
umbilical cord for blood vessels. Which finding is considered to be within
normal limits?
,a. One artery and one vein
b. Two veins and one artery
c. Two arteries and one vein
d. Two arteries and two veins -✔✔ ANS: C
The umbilical cord contains two arteries and one vein to transport blood
between the fetus and the placenta. Any option other than two arteries and
one vein is considered abnormal and requires further assessment. Two
veins and one artery is abnormal and may indicate an anomaly. Two
arteries instead is a normal finding; this infant would require further
assessment for anomalies due to the finding of two veins.
What is the purpose of the ovum's zona pellucida?
a. Prevents multiple sperm from fertilizing the ovum
b. Stimulates the ovum to begin mitotic cell division
c. Allows the 46 chromosomes from each gamete to merge
d. Makes a pathway for more than one sperm to reach the ovum -✔✔ ANS:
A
Fertilization causes the zona pellucida to change its chemical composition
so that multiple sperm cannot fertilize the ovum. Mitotic cell division begins
,when the nuclei of the sperm and ovum unite. Each gamete (sperm and
ovum) has only 23 chromosomes; there will be 46 chromosomes when they
merge. Once sperm has entered the ovum, the zona pellucida changes to
prevent other sperm from entering.
The nurse is explaining the process of cell division during the preembryonic
period to a group of nursing students. Which statement best describes the
characteristics of the morula?
a. Fertilized ovum before mitosis begins
b. Double layer of cells that becomes the placenta
c. Flattened, disk-shaped layer of cells within a fluid-filled sphere
d. Solid ball composed of the first cells formed after fertilization -✔✔ ANS:
D
The morula is so named because it resembles a mulberry. It is a solid ball
of 12 to 16 cells that develops after fertilization. The fertilized ovum is
called the zygote. The placenta is formed from two layers of cells—the
trophoblast, which is the other portion of the fertilized ovum, and the
decidua, which is the portion of the uterus where implantation occurs. The
flattened, disk-shaped layer of cells is the embryonic disk; it will develop
into the body.
, The upper uterus is the best place for the fertilized ovum to implant due to
which anatomical adaptation?
a. Maternal blood flow is lower.
b. Placenta attaches most firmly.
c. Uterine endometrium is softer.
d. Developing baby is best nourished -✔✔ ANS: D
The uterine fundus is richly supplied with blood and has the thickest
endometrium, both of which promote optimum nourishment of the fetus.
The blood supply is rich in the fundus, which allows for optimal nourishment
of the fetus. If the placenta attaches too deeply, it does not easily detach.
Softness is not a concern with implantation; attachment and nourishment
are the major concerns.
Some of the embryo's intestines remain within the umbilical cord during the
embryonic period because the
a. intestines need this time to grow until week 15.
b. nutrient content of the blood is higher in this location.
c. abdomen is too small to contain all the organs while they are developing.
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