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

A.

Lungs

B.

Heart

C.

Kidney

D.

Liver

Answer and Explanation

The Correct Answer is D

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. 


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Related Questions

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.

Correct Answer is B

Explanation

A. Implantation of the zygote does not affect the determination of biological sex. The biological sex is already determined at the time of fertilization.

B. Sex chromosomes (XX for female and XY for male) determine biological sex. This combination is established at fertilization when the sperm and egg combine to form the zygote.

C. The foramen ovale is a hole in the fetal heart that allows blood to bypass the lungs in utero and is unrelated to the determination of biological sex.

D. The blastocyst formation is an early developmental stage after fertilization but does not determine biological sex. It is the combination of sex chromosomes that determines whether the fetus is male or female.

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