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.
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View Related questions
Correct Answer is ["A","B","C","D","E","F"]
Explanation
B. Remove the newborn from phototherapy every 4 hours for thorough assessment of adverse effects of phototherapy.
D. Maintain an eye mask over the newborn's eyes.
E. Reposition the newborn every 2 hours.
F. Report sunken fontanels to the provider. Contraindicated:
A. Apply lotion to the skin every 4 hours.
C. Newborn feedings should be every 8 hours.
Correct Answer is A
Explanation
Choice A rationale
Uteroplacental insufficiency leads to late decelerations, which are characterized by a gradual decrease in fetal heart rate after the peak of a contraction. This indicates compromised blood flow between the uterus and placenta, affecting the fetus.
Choice B rationale
Umbilical cord compression usually causes variable decelerations, not late decelerations.
Choice C rationale
Maternal bradycardia does not cause changes in fetal heart rate patterns like late decelerations.
Choice D rationale
Fetal head compression causes early decelerations, which coincide with contractions, not late decelerations.