The nursing instructor is illustrating the circulatory flow between the mother and fetus.
The instructor determines the session is successful when the class correctly chooses which structure with which route.
The one umbilical vein carries oxygen-rich blood to the fetus from the placenta.
The two umbilical arteries carry waste products from the placenta to the fetus.
The two umbilical veins carry waste products from the fetus to the placenta.
The one umbilical artery carries oxygen-rich blood to the fetus from the placenta.
The Correct Answer is A
The umbilical vein carries oxygen-rich blood to the fetus from the placenta.
The umbilical vein is an important part of fetal circulation and carries oxygenated blood from the placenta into the growing fetus.

Choice B is incorrect because the two umbilical arteries carry deoxygenated blood from the fetus to the placenta23.
Choice C is incorrect because there are not two umbilical veins, but only one12.
Choice D is incorrect because it is not the one umbilical artery that carries oxygen-rich blood to the fetus from the placenta, but rather the one umbilical vein14.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B
Explanation
28 to 40 pounds (13 to 18 kilograms).
Women with a low BMI (under 18.5) should gain between 28 to 40 pounds (13 to 18 kilograms) throughout their pregnancy.
Choice A, 15 to 25 pounds (7 to 11 kilograms), is incorrect because it is the recommended weight gain for women who are overweight before pregnancy.
Choice C, 16 to 30 pounds (7.25 to 14 kilograms), is incorrect because it does not fall within the recommended weight gain range for women with a low BMI.
Choice D, 25 to 35 pounds (11 to 16 kilograms), is incorrect because it is the recommended weight gain for women who are at a healthy weight before pregnancy.
Correct Answer is D
Explanation
True labor contractions continue and become stronger over time.
Choice A is incorrect because true labor contractions are usually regular and become longer over time.
Choice B is incorrect because true labor contractions are usually not relieved by walking.
Choice C is incorrect because, during true labor, the cervix dilates to allow for the baby to pass through the birth canal.
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