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 A
Explanation
Choice A rationale
Betamethasone is a corticosteroid that accelerates fetal lung maturity by increasing the production of surfactant, which reduces respiratory distress syndrome in preterm infants.
Choice B rationale
While betamethasone can cause transient increases in fetal heart rate, its primary purpose is not to increase fetal heart rate. Its role is in enhancing lung maturity.
Choice C rationale
Betamethasone does not directly increase amniotic fluid levels. Its main function is in the maturation of fetal lungs.
Choice D rationale
Betamethasone is not used to stop preterm labor contractions. It is used to accelerate fetal lung development in preterm labor cases.
Correct Answer is C
Explanation
Choice A rationale
Male condoms are effective in preventing pregnancy and sexually transmitted infections, but their reliability can be compromised by improper use or breakage.
Choice B rationale
Vaginal rings provide hormonal contraception and are effective, but they may be less reliable compared to implants due to potential for incorrect use.
Choice C rationale
Hormonal implants are highly reliable because they provide continuous contraception over an extended period (up to 3-5 years) with minimal user intervention.
Choice D rationale
Oral contraceptives are effective when taken correctly, but their reliability can be reduced by missed doses or incorrect use.