Nokea
The embryo is termed a fetus at which stage of prenatal development?
- A. 2 weeks
- B. 4 weeks
- C. 9 weeks
- D. 16 weeks
Correct Answer: C
Rationale: The fetus (third stage of prenatal development) begins at the ninth week and continues until the 40th week of gestation or until birth.
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A woman who is 25 weeks pregnant asks the nurse what her fetus looks like. What does the nurse explain is one physical characteristic present in a 25-week-old fetus?
- A. Lanugo covering the body
- B. Constant motion
- C. Skin that is pink and smooth
- D. Eyes that are closed
Correct Answer: A
Rationale: By 25 weeks, the body of the fetus is covered with lanugo, the eyes are open, the skin is wrinkled, and the fetus has definite periods of movement and sleeping.
What does the nurse explain can affect the survival of the X- and Y-bearing sperm after intercourse?
- A. Age
- B. Estrogen level
- C. Body temperature
- D. Level of feminine hygiene
Correct Answer: B
Rationale: Estrogen levels and the pH of the female reproductive tract can affect the survival of the X and Y-bearing sperm as well as their motility.
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.
The nurse is educating a class of expectant parents about fetal development. What is considered fetal age of viability?
- A. 14 weeks
- B. 20 weeks
- C. 25 weeks
- D. 30 weeks
Correct Answer: B
Rationale: By 20 weeks of gestation, the lungs have matured enough for the fetus to survive outside the uterus (age of viability).
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.