The nurse is educating a class of expectant parents about fetal development. What is considered fetal age of viability?

Answer and Explanation

The Correct Answer is C

A. At 8 weeks, the embryo is transitioning into the fetal stage of development and is not viable outside the womb. Organs are still in the early stages of formation.

B. While some sources may consider 24 weeks the age of "reasonable viability" with intensive medical support, many medical guidelines recognize viability beginning as early as 20 weeks under optimal conditions.

C. The age of 20 weeks is often cited as the lower threshold of fetal viability due to improved neonatal care, although survival rates improve significantly after this point.

D. At 14 weeks, the fetus is in the second trimester, but it is far too underdeveloped for survival outside the womb.

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Correct Answer is D

Explanation

A. The lungs are bypassed by the foramen ovale and ductus arteriosus in fetal circulation, not the ductus venosus.

B. The heart is a critical pumping organ, so no blood is diverted away from it in fetal circulation.

C. The kidneys process blood, but fetal blood bypasses the liver via the ductus venosus rather than the kidneys.

D. The ductus venosus allows oxygen-rich blood from the umbilical vein to bypass the liver and flow directly into the inferior vena cava, ensuring that well-oxygenated blood reaches vital fetal organs, such as the brain and heart, more efficiently.

A. Very low because that is not the woman's fertile period. B. Uncertain because the ovum lives only for 24 hours. C. Unknown because the ovum lives only for 24 hours. D. Very low because the woman may not ovulate at all.

Correct Answer is B

Explanation

A. This statement is incorrect because sperm can survive inside the female reproductive tract for up to 5 days, meaning intercourse before ovulation can still result in pregnancy.

B. Uncertain is correct because while the egg does live only for about 24 hours after ovulation, sperm can survive for several days. Thus, intercourse 3 days before ovulation could still lead to pregnancy if sperm are still viable when the egg is released.

C. The ovum's survival time is generally known, so the risk is based on sperm viability and timing, not uncertainty about the egg.

D. While ovulation is necessary for conception, predicting it with certainty is not always possible, so this option is not entirely accurate.

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The nurse is educating a class of expectant parents about fetal development. What is considered fetal age of viability?

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Naxlex Comprehensive Predictor Exams

In fetal circulation, the ductus venosus diverts blood from which of the following organs?

Correct Answer is D

Explanation

When a couple has unprotected sexual intercourse 3 days before the woman ovulates, the risk of the woman becoming pregnant is:

Correct Answer is B

Explanation

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