Nokea
An expectant father asks the nurse, “Which part of the mature sperm contains the male chromosome?” What is the correct response by the nurse?
- A. X-bearing sperm
- B. The tail of the sperm
- C. The head of the sperm
- D. The middle portion of the sperm
Correct Answer: C
Rationale: The correct response is C: The head of the sperm. The head of the sperm contains the genetic material, including the male chromosome (Y chromosome). This is where the genetic information determining the sex of the offspring is located. The tail of the sperm is responsible for movement, not genetic material. X-bearing sperm would contain the female chromosome, not the male chromosome. The middle portion of the sperm does not specifically contain the genetic material related to determining the sex of the offspring.
You may also like to solve these questions
With regard to the development of the respiratory system, maternity nurses should understand that:
- A. The respiratory system does not begin developing until after the embryonic stage.
- B. The infant's lungs are considered mature when the lecithin/sphingomyelin [L/S] ratio is 1:1, at about 32 weeks.
- C. Maternal hypertension can reduce maternal-placental blood flow, accelerating lung maturity.
- D. Fetal respiratory movements are not visible on ultrasound scans until at least 16 weeks.
Correct Answer: C
Rationale: A reduction in placental blood flow stresses the fetus, increases blood levels of corticosteroids, and accelerates lung maturity.
Sally comes in for her first prenatal examination. This is her first child. She asks you (the nurse), 'How does my baby get air inside my uterus?' The correct response is:
- A. The baby's lungs work in utero to exchange oxygen and carbon dioxide.
- B. The baby absorbs oxygen from your blood system.
- C. The placenta provides oxygen to the baby and excretes carbon dioxide into your bloodstream.
- D. The placenta delivers oxygen-rich blood through the umbilical artery to the baby's abdomen.
Correct Answer: C
Rationale: The placenta functions by supplying oxygen and excreting carbon dioxide to the maternal bloodstream.
Where does conception most commonly occur?
- A. None
- B. In the ampulla of the fallopian tube.
- C. None
- D. None
Correct Answer: B
Rationale: Fertilization typically occurs in the ampulla.
A nurse is conducting prenatal education classes for a group of expectant parents. Which information should the nurse include in her discussion of the purpose of amniotic fluid? (Select all that apply.)
- A. Cushions the fetus
- B. Protects the skin of the fetus
- C. Provides nourishment for the fetus
- D. Allows for buoyancy for fetal movement
Correct Answer: A
Rationale: The correct answer is A: Cushions the fetus. Amniotic fluid acts as a cushion that protects the fetus from physical trauma and provides a stable environment for fetal growth. It helps prevent compression injuries and maintains a constant temperature. The other choices are incorrect because: B) Protects the skin of the fetus: While amniotic fluid does provide some protection, its main purpose is cushioning. C) Provides nourishment for the fetus: The placenta is responsible for providing nourishment to the fetus, not amniotic fluid. D) Allows for buoyancy for fetal movement: While amniotic fluid does allow for buoyancy, its primary function is to cushion the fetus.
Approximately 3 days after fertilization, what is the term for the developing zygote, which is a 16-cell mass?
- A. Trophoblast
- B. Morula
- C. Blastocyst
- D. Embryoblast
Correct Answer: B
Rationale: The correct answer is B: Morula. At approximately 3 days post-fertilization, the zygote undergoes multiple cell divisions, forming a 16-cell mass known as a morula. This stage precedes the formation of a blastocyst, which occurs around day 5. The trophoblast refers to the outer layer of cells in the blastocyst responsible for implantation, while the embryoblast is the inner cell mass that gives rise to the embryo. Therefore, the morula stage accurately represents the 16-cell mass at this specific developmental timeline.