Nokea
Why do infants born at 25 weeks' gestation have a poor survival rate?
- A. Cardiac development is incomplete.
- B. Fetal lung alveoli are not present in sufficient numbers.
- C. Gastrointestinal development is incomplete.
- D. Sucking reflex is not present.
Correct Answer: B
Rationale: The correct answer is B because infants born at 25 weeks' gestation have a poor survival rate due to insufficient numbers of fetal lung alveoli. This leads to respiratory distress and difficulty in oxygen exchange, impacting their chances of survival. Choice A is incorrect as cardiac development is not the primary factor affecting survival. Choice C is incorrect as gastrointestinal development does not directly impact survival at this stage. Choice D is incorrect as the sucking reflex is not a critical factor in survival compared to respiratory function.
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What is an example of a statement by the patient that indicates effective teaching by the nurse about methods to improve fertility?
- A. “Caffeine does not affect my fertility.”
- B. “I should start taking prenatal vitamins to increase my chances of conception.”
- C. “My partner should avoid any exercise while we are trying to conceive to avoid damaging the sperm.”
- D. “Smoking can increase my risk of miscarriage.”
Correct Answer: D
Rationale: The correct answer is D because it accurately reflects the nurse's teaching on fertility. Smoking is known to have negative effects on fertility and can increase the risk of miscarriage. This statement shows that the patient has understood the information provided by the nurse regarding factors that could impact fertility.
A is incorrect because caffeine can actually affect fertility. B is incorrect because while taking prenatal vitamins is beneficial, it does not directly address fertility improvement. C is incorrect as exercise is generally beneficial for fertility and does not necessarily harm sperm.
The nurse caring for the laboring woman should know that meconium is produced by:
- A. Fetal intestines.
- B. Fetal kidneys.
- C. Amniotic fluid.
- D. The placenta.
Correct Answer: A
Rationale: As the fetus nears term, fetal waste products accumulate in the intestines as dark green-to-black, tarry meconium.
What is the point after which an ovum is fertilized and becomes impenetrable to any other sperm?
- A. The zona reaction
- B. Gametogenesis
- C. The zona pellucida
- D. Cleavage
Correct Answer: A
Rationale: The correct answer is A: The zona reaction. After fertilization, the zona pellucida undergoes a biochemical change called the zona reaction, which makes the ovum impenetrable to any other sperm. This process prevents polyspermy and ensures that only one sperm can fertilize the egg. Gametogenesis refers to the production of gametes, not the post-fertilization event. The zona pellucida is the glycoprotein layer around the ovum, and cleavage is the rapid mitotic cell division that follows fertilization, but neither of these directly relate to the ovum becoming impenetrable to other sperm.
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.
The nurse is reviewing the schedule for the OB/GYN she works for. In reviewing a patient’s chart, the nurse notes the patient is 32 weeks pregnant, has hypertension, and had a previous fetal death. What test does the nurse anticipate the provider will order?
- A. a contraction stress test
- B. amniotic fluid index
- C. nonstress test
- D. fetal movement count
Correct Answer: C
Rationale: The correct answer is C: nonstress test. A nonstress test is used to assess fetal well-being by monitoring the baby's heart rate in response to its own movements. In this case, the patient's history of hypertension and previous fetal death indicate a higher risk pregnancy, making it important to monitor the baby's well-being. A contraction stress test (choice A) is not suitable for a patient with hypertension as it can induce contractions and potentially harm the baby. An amniotic fluid index (choice B) is used to evaluate amniotic fluid levels and is not specific to this patient's situation. Fetal movement count (choice D) assesses the baby's movements but does not provide real-time information on fetal well-being like a nonstress test does.