Nokea
The nurse is reviewing fetal circulation with a pregnant patient and explains that blood circulates through the placenta to the fetus. What vessel(s) carry blood to the fetus?
- A. One umbilical vein
- B. Two umbilical veins
- C. One umbilical artery
- D. Two umbilical arteries
Correct Answer: A
Rationale: The umbilical vein transports richly oxygenated blood from the placenta to the fetus.
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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.
What organ does the ductus venosus shunt blood away from in fetal circulation?
- A. Liver
- B. Heart
- C. Lungs
- D. Kidneys
Correct Answer: A
Rationale: Fetal blood bypasses the liver through the ductus venosus by carrying blood directly to the inferior vena cava.
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.
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.
When preparing to teach a class about prenatal development, the nurse would include information about folic acid supplementation. What is folic acid known to prevent?
- A. Congenital heart defects
- B. Neural tube defects
- C. Mental retardation
- D. Premature birth
Correct Answer: B
Rationale: It is now known that folic acid supplements can prevent neural tube defects such as spina bifida.