Nokea
The time period immediately following fertilization results in which circumstance?
- A. Formation of a zygote that contains the haploid number of chromosomes
- B. Formation of an embryo that contains the haploid number of chromosomes
- C. Formation of a zygote that contains the diploid number of chromosomes
- D. Formation of a 16-cell morula
Correct Answer: C
Rationale: The correct answer is C: Formation of a zygote that contains the diploid number of chromosomes. After fertilization, the sperm and egg combine to form a zygote with a complete set of chromosomes (diploid). This is crucial for genetic diversity and proper development.
Choice A is incorrect because a zygote is diploid, not haploid. Choice B is incorrect as an embryo is formed later in development and contains diploid chromosomes. Choice D is incorrect because a morula is a stage where the zygote undergoes several rounds of cell division, but it does not yet contain a full diploid set of chromosomes.
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The measurement of lecithin in relation to sphingomyelin (L/S ratio) is used to determine fetal lung maturity. Which ratio reflects maturity of the lungs?
- A. 1.4:1
- B. 1.8:1
- C. 2:01
- D. 1:01
Correct Answer: C
Rationale: A ratio of 2:1 indicates lung maturity.
The fetal heartbeat should be visible on ultrasound by the:
- A. Fourth week following the last menstrual period.
- B. Sixth week following the last menstrual period.
- C. Ninth week following the last menstrual period.
- D. Twelfth week following the last menstrual period.
Correct Answer: B
Rationale: The fetal heartbeat is typically visible on ultrasound by the sixth week of gestation.
Which immunoglobulin is the only one that crosses the placenta during pregnancy?
- A. IgG
- B. IgA
- C. IgM
- D. IgD
Correct Answer: A
Rationale: The correct answer is A: IgG. IgG is the only immunoglobulin that can cross the placenta due to its small size and ability to bind to the neonatal Fc receptor. This transfer provides passive immunity to the fetus, protecting it from infections. IgA primarily functions in mucosal immunity and is found in secretions like breast milk. IgM is too large to cross the placenta and is mainly produced in response to acute infections. IgD is primarily found on the surface of B cells and functions in the activation of these cells.
A woman is 15 weeks pregnant with her first baby. She asks how long it will be before she feels the baby move. The best answer is:
- A. You should have felt the baby move by now.
- B. Within the next month, you should start to feel fluttering sensations.
- C. The baby is moving; however, you can't feel it yet.
- D. Some babies are quiet, and you don't feel them move.
Correct Answer: B
Rationale: Maternal perception of fetal movement usually begins 16 to 20 weeks after conception.
The nurse is counseling a couple who just learned their 16-week fetus tested positive for a serious genetic disorder. Which action by the nurse is inappropriate upon learning that the couple plan to continue the pregnancy?
- A. Determine whether termination is still a consideration.
- B. Explain they will experience grief, which is normal.
- C. Provide additional information about the disorder.
- D. Refer them to a disorder-specific support group.
Correct Answer: A
Rationale: The correct answer is A because it respects the couple's decision-making autonomy. The nurse should support their choice to continue the pregnancy without suggesting termination. Providing information, emotional support, and connecting them with a support group are appropriate actions. It is crucial to respect the couple's decision and provide compassionate care regardless of their choice. The other choices are incorrect because they may undermine the couple's autonomy and may not be aligned with their wishes.