Nokea
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.
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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 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).
Which hormone is responsible for converting the endometrium into decidual cells for implantation?
- A. Estrogen
- B. Human chorionic gonadotropin
- C. Human placental lactogen
- D. Progesterone
Correct Answer: D
Rationale: At high levels, progesterone maintains the endometrial lining for implantation of the zygote.
A patient at the obstetric office has just learned she is pregnant with dizygotic twins. What facts will the nurse include when educating this patient? (Select all that apply.)
- A. Dizygotic twins are the same sex.
- B. Dizygotic twins share a placenta.
- C. Dizygotic pregnancies tend to repeat in families.
- D. Dizygotic twins have separate chorions.
- E. Dizygotic twin incidence decreases with maternal age.
Correct Answer: C,D
Rationale: Dizygotic twins tend to repeat in families and have separate chorions. They can be the same sex or different sexes and have their own placenta. Incidence increases with maternal age.
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.