Nokea
What is the embryonic membrane that contains fingerlike projections on its surface, which attach to the uterine wall?
- A. Amnion
- B. Yolk sac
- C. Chorion
- D. Decidua basalis
Correct Answer: C
Rationale: The chorion is a thick membrane with fingerlike projections (villi) on its outermost surface.
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What are the functions of amniotic fluid? (Select all that apply.)
- A. Maintaining an even temperature
- B. Impeding excessive fetal movement
- C. Lubricating fetal skin
- D. Acting as a reservoir for nutrients
- E. Acting as a cushion for the fetus
Correct Answer: A,E
Rationale: The amniotic fluid provides maintenance of even temperature; prevents amnion from adhering to fetal skin; allows buoyancy, symmetrical growth, and fetal movement; and acts as a cushion for the fetus. Although the fetus does swallow amniotic fluid, it has no nutritional value.
Of what is the normal umbilical cord comprised?
- A. 1 artery carrying blood to the fetus and 1 vein carrying blood away from the fetus
- B. 1 artery carrying blood to the fetus and 2 veins carrying blood away from the fetus
- C. 2 arteries carrying blood away from the fetus and 1 vein carrying blood to the fetus
- D. 2 arteries carrying blood to the fetus and 2 veins carrying blood away from the fetus
Correct Answer: C
Rationale: The umbilical cord is comprised of 2 arteries carrying blood away from the fetus and 1 vein carrying blood to the fetus.
The nurse explains that the birth weight of monozygotic twins is frequently below average. What is the most likely cause?
- A. Inadequate space in the uterus
- B. Inadequate blood supply
- C. Inadequate maternal health
- D. Inadequate placental nutrition
Correct Answer: D
Rationale: The single placenta may not be able to provide adequate nutrition to two fetuses.
A pregnant woman states, 'My husband hopes I will give him a boy because we have three girls.' What will the nurse explain to this woman?
- A. The sex chromosome of the fertilized ovum determines the gender of the child.
- B. When the sperm and ovum are united, there is a 75% chance the child will be a girl.
- C. When the pH of the female reproductive tract is acidic, the child will be a girl.
- D. If a sperm carrying a Y chromosome fertilizes an ovum, then a boy is produced.
Correct Answer: D
Rationale: When a Y-bearing sperm fertilizes an ovum, a male child is produced.
At what point in prenatal development do the lungs begin to produce surfactant?
- A. 17 weeks
- B. 20 weeks
- C. 25 weeks
- D. 30 weeks
Correct Answer: C
Rationale: During week 25, the alveoli begin to produce surfactant, which enables the alveoli to stay open for adequate lung oxygenation to occur.