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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?

A.

Placenta formation.

B.

Fertilization.

C.

Organogenesis.

D.

Implantation.

Answer and Explanation

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 D

Explanation

Choice A rationale

External fetal monitors are non-invasive and do not pose a risk of transmitting HIV from mother to baby. They are considered safe for monitoring fetal well-being in an HIV-positive mother.

Choice B rationale

Administering antiviral medication is essential in reducing the risk of mother-to-child transmission of HIV. It's a standard care practice for managing HIV-positive pregnant women.

Choice C rationale

Preparing for a caesarean section may be recommended to reduce the risk of vertical transmission of HIV during delivery, especially if the viral load is high.

Choice D rationale

Internal fetal scalp electrodes are contraindicated because they can create a portal for HIV transmission from mother to baby through small abrasions or punctures on the fetal scalp.

Correct Answer is C

Explanation

Choice A rationale

Clapping hands to assess hearing is not a reliable method and could startle the baby for reasons unrelated to hearing ability.

Choice B rationale

While a newborn might respond to visual stimuli, this is not a definitive method to assess hearing.

Choice C rationale

Routine hearing screenings using objective tests are the best way to determine a newborn's hearing ability, providing accurate and early detection of potential hearing issues.

Choice D rationale

This statement is misleading, as some forms of hearing loss can be inherited. It's important to use accurate methods to assess newborn hearing.

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