Nokea
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.
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A couple just learned they are expecting their first child and are curious if they are having a boy or a girl. At what point of development can the couple first expect to see the sex of their child on ultrasound?
- A. 4 weeks' gestational age
- B. 6 weeks' gestational age
- C. 10 weeks' gestational age
- D. 16 weeks' gestational age
Correct Answer: C
Rationale: The fetal period begins at the 9th week, and by the 10th week the external genitalia are visible to ultrasound examination.
Where is the usual location for implantation of the zygote?
- A. Upper section of the posterior uterine wall
- B. Lower portion of the uterus near the cervical os
- C. Inner third of the fallopian tube near the uterus
- D. Lateral aspect of the uterine wall
Correct Answer: A
Rationale: The zygote usually implants in the upper section of the posterior uterine wall.
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 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 is the total number of chromosomes contained in a mature sperm or ovum?
- A. 22
- B. 23
- C. 44
- D. 46
Correct Answer: B
Rationale: Gametes (sex cells) contain 23 chromosomes.