Nokea
During an ultrasound, two amnions and two placentas are observed. What will be the most likely result of this pregnancy?
- A. Dizygotic twins
- B. Monozygotic twins
- C. Conjoined twins
- D. High-birth weight twins
Correct Answer: A
Rationale: Dizygotic twins always have two amnions and two chorions (placentas).
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What is the most common site for fertilization?
- A. Lower segment of the uterus
- B. Outer third of the fallopian tube near the ovary
- C. Upper portion of the uterus
- D. Area of the fallopian tube farthest from the ovary
Correct Answer: B
Rationale: Fertilization takes place in the outer third of the fallopian tube, which is closest to the ovary.
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.
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.
The school nurse is counseling a group of adolescent girls. What does the nurse explain about sperm ejaculated near the cervix?
- A. They are destroyed by the acidic pH of the vagina.
- B. They survive up to 5 days and can cause pregnancy.
- C. They lose their motility in about 12 hours after intercourse.
- D. They are usually pushed out of the vagina by the muscular action of the vaginal wall.
Correct Answer: B
Rationale: Sperm ejaculated near the cervix can survive up to 5 days and cause pregnancy even before ovulation.
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).