A pregnant client asks about the functions of the placenta.Which of the following items should the nurse NOT include in the teaching plan?

Fetal nutrition and excretion are carried out by the placenta.

Fetal respirations are carried out by the placenta.

The placenta filters harmful substances from maternal blood.

The placenta receives maternal blood from the uterine arteries.

Answer and Explanation

The Correct Answer is C

Choice A rationale

Fetal nutrition and excretion are carried out by the placenta. This statement is correct. The placenta provides essential nutrients to the fetus and removes waste products from fetal blood.

Choice B rationale

Fetal respirations are carried out by the placenta. This statement is correct. The placenta facilitates gas exchange, providing oxygen to the fetus and removing carbon dioxide.

Choice C rationale

The placenta filters harmful substances from maternal blood. This statement is incorrect. While the placenta provides some barrier function, it does not filter all harmful substances from maternal blood, and certain drugs and toxins can cross the placental barrier and affect the fetus.

Choice D rationale

The placenta receives maternal blood from the uterine arteries. This statement is correct. Maternal blood flows to the placenta via the uterine arteries, supplying oxygen and nutrients to the fetal side of the placenta.

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Correct Answer is B

Explanation

Choice A rationale

Hepatitis B immune globulin at 1 week followed by hepatitis B vaccine monthly for 6 months is incorrect. This schedule delays the immune response and leaves the infant unprotected during the critical early period when the risk of transmission is highest.

Choice B rationale

Hepatitis B immune globulin and hepatitis B vaccine within 12 hr of birth is the correct approach. This combination provides immediate passive immunity through the immune globulin and active immunity through the vaccine, significantly reducing the risk of hepatitis B transmission from mother to child.

Choice C rationale

Hepatitis B vaccine monthly until the newborn tests negative for the hepatitis B surface antigen is incorrect. Monthly administration alone is insufficient without the initial dose of immune globulin, especially since the infant may remain at risk until the negative test result.

Choice D rationale

Hepatitis B vaccine at 24 hr followed by hepatitis B immune globulin every 12 hr for 3 days is incorrect. The delay in the first vaccine dose reduces its efficacy, and the immune globulin schedule does not align with established guidelines for preventing hepatitis B transmission.

Correct Answer is ["July 27"]

Explanation

Step 1 is to identify the first day of the last menstrual period (LMP), which is October 20.

Step 2 is to count back 3 months from October 20, resulting in July 20.

Step 3 is to add 1 year to July 20, resulting in July 20 of the following year.

Step 4 is to add 7 days to July 20, resulting in July 27.

Final calculated answer: July 27 of the following year.

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A pregnant client asks about the functions of the placenta.Which of the following items should the nurse NOT include in the teaching plan?

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Naxlex Comprehensive Predictor Exams

A nurse is caring for a newborn whose mother is positive for the hepatitis B surface antigen.Which of the following should the infant receive?

Correct Answer is B

Explanation

A pregnant client tells the nurse that her LMP was 3 months ago and began on October 20. Using Naegele's rule, calculate the client's estimated date of delivery. Answer format: "October 20"

Correct Answer is ["July 27"]

Explanation

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