The maternity nurse understands that as the uterus contracts during labor, maternal-fetal exchange of oxygen and waste products:

Is not significantly affected.

Increases as blood pressure decreases.

Continues except when placental functions are occluded.

Diminishes as the spiral arteries are compressed.

Answer and Explanation

The Correct Answer is D

Choice A rationale
The maternal-fetal exchange of oxygen and waste products is affected by uterine contractions, as these compress the placental blood vessels, temporarily reducing blood flow.
Choice B rationale
Blood pressure variations during labor can influence perfusion but do not increase maternal-fetal exchange as uterine contractions primarily cause transient vascular compression.
Choice C rationale
Maternal-fetal exchange continues during contractions except when the uterine pressure is high enough to occlude placental blood flow, temporarily halting the exchange.
Choice D rationale
Uterine contractions compress the spiral arteries, reducing blood flow through the placenta, thereby diminishing maternal-fetal exchange of oxygen and waste products during contractions.

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Correct Answer is A

Explanation

Choice A rationale
Meconium is produced by the fetal intestines. The intestines start to form meconium around the 16th week of gestation. Meconium is composed of shed cells, mucus, amniotic fluid, bile, and lanugo.
Choice B rationale
The placenta does not produce meconium. Its primary functions include nutrient transfer, gas exchange, and waste elimination, but it does not have the structures necessary for the production of meconium.
Choice C rationale
Amniotic fluid does not produce meconium. Amniotic fluid surrounds and protects the fetus but does not contain the components needed to create meconium. Instead, the fetus swallows and then excretes it into the intestines.
Choice D rationale
Fetal kidneys are responsible for filtering waste and producing urine, but they do not produce meconium. The production of meconium is a function of the intestines, not the kidneys.

A. Fetal movement felt by pregnant woman. B. Fetal heart rate noted on ultrasound. C. A positive pregnancy test. D. Braxton Hicks contractions.

Correct Answer is B

Explanation

Choice A rationale
Fetal movement felt by the pregnant woman is a presumptive sign of pregnancy, indicating probable fetal presence, but not definitive evidence.
Choice B rationale
Fetal heart rate noted on ultrasound is a positive sign of pregnancy, providing objective evidence of fetal existence within the uterus.
Choice C rationale
A positive pregnancy test indicates probable pregnancy due to hormonal presence, but it is not a definitive confirmation without further clinical evidence.
Choice D rationale
Braxton Hicks contractions are considered probable signs of pregnancy, as they indicate uterine activity without confirming the presence of a fetus.

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The maternity nurse understands that as the uterus contracts during labor, maternal-fetal exchange of oxygen and waste products:

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Naxlex Comprehensive Predictor Exams

The nurse caring for the laboring woman should know that meconium is produced by:

Correct Answer is A

Explanation

The nurse teaches a pregnant woman about the presumptive, probable, and positive signs of pregnancy. The woman demonstrates understanding of the nurse’s instructions if she states that a positive sign of pregnancy is:

Correct Answer is B

Explanation

A woman at 40 weeks gestation calls the labor unit to see whether or not she should go to the hospital to be evaluated. Which of the following statements by the woman indicates that she is probably in labor and should proceed to the hospital?

The factors that affect the process of labor and birth, known commonly as the five Ps, include all except:

The slight overlapping of cranial bones or shaping of the fetal head during labor is called:

The client has been having contractions every 5 minutes for 7 hours. Which factor would the nurse use to determine if this is true labor?

As relates to the structure and function of the placenta, the nurse should be aware that.

A woman is 15 weeks pregnant with her first baby. She asks how long it will be before she feels the baby move. The best answer is:

Along with gas exchange and nutrient transfer, the placenta produces many hormones necessary for normal pregnancy. These include (select all that apply):

The nurse caring for a client in labor observes the external fetal monitor tracing showing that there are accelerations with moderate variability. Which of the following actions is most appropriate?