Which maternal hormone reduces uterine contractions to prevent spontaneous abortions?

Estrogen

Testosterone

Aldosterone

Progesterone

Answer and Explanation

The Correct Answer is D

A. Estrogen plays a role in the development of the uterus and regulation of menstrual cycles, but it does not primarily reduce uterine contractions.

B. Testosterone is a male hormone and does not play a significant role in preventing uterine contractions during pregnancy.

C. Aldosterone helps regulate fluid balance and blood pressure, but it is not responsible for reducing uterine contractions during pregnancy.

D. Progesterone is the hormone primarily responsible for maintaining pregnancy by inhibiting uterine contractions, promoting uterine relaxation, and supporting the early stages of pregnancy. It plays a critical role in preventing spontaneous abortion, especially in early pregnancy.

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Correct Answer is A

Explanation

A. The maternal-fetal circulation is established by 12 weeks of gestation, allowing oxygen and nutrients to be exchanged between the mother and fetus through the placenta.
B. Lanugo begins developing around 20 weeks and starts to disappear closer to week 36, rather than covering the entire body at that time.
C. Fetal movement (quickening) is usually felt between 16-20 weeks, not as late as 24 weeks.
D. The sex of the baby is determined at conception, but external genitalia do not fully differentiate until around 12-14 weeks, not at 8 weeks.

A. Prior to giving birth B. Two weeks before attempting pregnancy again C. When she does not desire future pregnancies D. Prior to discharge from the hospital after giving birth

Correct Answer is C

Explanation

A. The MMR vaccine is contraindicated during pregnancy because it is a live vaccine. It is not safe to administer it during pregnancy due to the risk of teratogenic effects.

B. The MMR vaccine should be administered after the pregnancy is completed, ideally before attempting a future pregnancy. The vaccine is effective in creating immunity but cannot be given while pregnant.

C. The MMR vaccine should be given when the woman is not pregnant, preferably after delivery and before future pregnancies. This allows the body to develop immunity to rubella, measles, and mumps.

D. Administering the MMR vaccine prior to discharge is not recommended while the client is still pregnant, as the vaccine is contraindicated during pregnancy.

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Which maternal hormone reduces uterine contractions to prevent spontaneous abortions?

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Naxlex Comprehensive Predictor Exams

A nurse is reinforcing teaching about fetal development with a group of women who are pregnant. Which of the following statements should the nurse include in the teaching?

Correct Answer is A

Explanation

A nurse is reinforcing teaching about immunizations with a woman in her first trimester of pregnancy whose diagnostic testing indicates she does not have immunity to rubella. The nurse should recommend that the client receive a measles, mumps, rubella (MMR) vaccine at which of the following times?

Correct Answer is C

Explanation

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