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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Correct Answer is C
Explanation
Choice A rationale
Accelerations are increases in the fetal heart rate (FHR) above the baseline, typically in response to fetal movement or uterine contractions. They indicate a healthy, well-oxygenated
fetus and are not consistent with the described pattern of decelerations.
Choice B rationale
Late decelerations are characterized by a gradual decrease in FHR that begins after the contraction has started, with the lowest point of the deceleration (nadir) occurring after the
peak of the contraction. They are associated with uteroplacental insufficiency and fetal hypoxia, which is not described in the scenario.
Choice C rationale
Early decelerations are a gradual decrease in FHR that mirrors the contraction, starting with the contraction and returning to baseline as the contraction ends. The nadir of the
deceleration occurs at the peak of the contraction, which fits the pattern described.
Choice D rationale
Variable decelerations are abrupt decreases in FHR that can occur at any time during the contraction cycle, usually due to umbilical cord compression. They are not uniform in
relation to contractions and can vary in duration, depth, and timing, unlike the described pattern.
Correct Answer is A
Explanation
Step 1 is: 12 mg ÷ 6 mg/ml.
Step 2 is: 12 ÷ 6 = 2 ml. Answer: 2 ml