During preconception counseling, the nurse explains that during the first 8 weeks the fetus is most vulnerable to the effects of teratogens.What is occurring during the first 8 weeks of gestation?
Placenta formation.
Fertilization.
Organogenesis.
Implantation.
The Correct Answer is C
Choice A rationale
Placenta formation begins shortly after implantation, but it continues to develop throughout the first trimester and into the early second trimester, making it less precise to attribute the first 8 weeks solely to this process.
Choice B rationale
Fertilization occurs within the first week after ovulation, marking the beginning of pregnancy, but it is a singular event that happens prior to the developmental processes vulnerable to teratogens.
Choice C rationale
Organogenesis is the critical period during which the major organs and structures of the fetus form, typically occurring between the third and eighth weeks of gestation. This is the time when the fetus is most susceptible to the effects of teratogens, which can cause congenital anomalies.
Choice D rationale
Implantation occurs approximately 6-10 days after fertilization, embedding the blastocyst into the uterine lining. While crucial, it is not the primary period when teratogenic effects are most significant, as this happens during organogenesis.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B
Explanation
Choice A rationale
Prophylactic treatment for cytomegalovirus during pregnancy isn't generally recommended. CMV detection should lead to close monitoring rather than prophylactic treatment, as current treatments pose risks without guaranteed efficacy.
Choice B rationale
Avoiding cat litter is crucial during pregnancy to prevent toxoplasmosis infection, which can cause severe fetal harm, including hydrocephalus, mental disabilities, and seizures, by transferring through contact with cat feces.
Choice C rationale
While avoiding crowded places can reduce general infection risks, it is not specifically associated with preventing TORCH infections. TORCH infections refer to a set of perinatal infections that pose particular risks to fetal health.
Choice D rationale
Rubella immunization should be done before pregnancy, not during, as live vaccines carry risks. A woman should confirm immunity before conception to protect against congenital rubella syndrome.
Correct Answer is C
Explanation
Choice A rationale
Sneezing is a reflex action to clear the nasal passages and is not a feeding cue. It does not indicate hunger but is more likely related to environmental irritants or the baby adjusting to breathing air.
Choice B rationale
Moving legs in a bicycle motion is a common newborn reflex that is associated with general activity or discomfort, rather than a specific signal of hunger. This movement is typically seen during periods of wakefulness or while the baby is trying to soothe themselves.
Choice C rationale
Putting their hand to their mouth is a well-recognized hunger cue in newborns. This behavior often precedes crying and indicates that the baby is ready to feed. It's a self-soothing mechanism that also signals hunger.
Choice D rationale
Extending both arms to the side of their body is more related to the Moro reflex, which is a startle reflex in response to a sudden movement or noise. It is not associated with feeding cues or hunger.
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