Nokea
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.
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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.
The nurse is presenting a conference on gene dominance. What does the nurse report as the percentage of children carrying the dominant gene if one parent has a dominant gene and the other parent does not?
- A. 10%
- B. 25%
- C. 50%
- D. 100%
Correct Answer: C
Rationale: If one parent has a dominant trait and the other does not, then 50% of the children will inherit the trait.
The normal volume of amniotic fluid is approximately __ mL at 37 weeks' gestation.
Correct Answer: 1000
Rationale: The volume of amniotic fluid steadily increases from about 30 mL at 10 weeks of pregnancy to 350 mL at 20 weeks. The volume of fluid is about 1000 mL at 37 weeks. In the latter part of pregnancy, the fetus may swallow up to 400 mL of amniotic fluid per day and normally excretes urine into the fluid.
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 embryonic membrane that contains fingerlike projections on its surface, which attach to the uterine wall?
- A. Amnion
- B. Yolk sac
- C. Chorion
- D. Decidua basalis
Correct Answer: C
Rationale: The chorion is a thick membrane with fingerlike projections (villi) on its outermost surface.