Nokea
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.
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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.
A pregnant woman states, 'My husband hopes I will give him a boy because we have three girls.' What will the nurse explain to this woman?
- A. The sex chromosome of the fertilized ovum determines the gender of the child.
- B. When the sperm and ovum are united, there is a 75% chance the child will be a girl.
- C. When the pH of the female reproductive tract is acidic, the child will be a girl.
- D. If a sperm carrying a Y chromosome fertilizes an ovum, then a boy is produced.
Correct Answer: D
Rationale: When a Y-bearing sperm fertilizes an ovum, a male child is produced.
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.
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.
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.