As relates to the structure and function of the placenta, the nurse should be aware that.
The placenta is able to keep out most potentially harmful substances.
As one of its early functions, the placenta acts as an endocrine gland.
As the placenta widens, it gradually thins to allow easier passage of air and nutrients.
Optimal blood circulation is achieved through the placenta during pregnancy.
The Correct Answer is B
Choice A rationale
Although the placenta acts as a partial barrier, it does not keep out all harmful substances, allowing some to cross and affect fetal development.
Choice B rationale
One of the placenta's early functions is producing hormones like human chorionic gonadotropin (hCG), estrogen, and progesterone, making it act as an endocrine gland.
Choice C rationale
The placenta does not thin out; it remains robust and increases in thickness to support the growing fetus and facilitate nutrient and gas exchange.
Choice D rationale
While optimal blood circulation through the placenta is crucial, this statement lacks detail on the specific structural and functional aspects of the placenta.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
Choice A rationale
Strong rectal pressure indicates advanced labor and potential imminent delivery, requiring immediate assessment of cervical dilation to ensure appropriate intervention and prevent complications.
Choice B rationale
Encouraging the patient to push without confirming cervical dilation could lead to cervical trauma or delivery complications if dilation is not complete, making this action inappropriate.
Choice C rationale
Notifying the MD without first assessing cervical dilation may cause unnecessary delay in intervention, potentially leading to complications during labor and delivery if the patient is fully dilated.
Choice D rationale
Offering the patient the bedpan when she feels strong rectal pressure can increase the risk of delivering the baby in an inappropriate setting, as the rectal pressure suggests imminent birth.
Correct Answer is C
Explanation
Choice A rationale
While iron-rich foods are important, the decrease in hematocrit is primarily due to hemodilution rather than inadequate iron intake. Hemodilution occurs as plasma volume increases more than red cell mass.
Choice B rationale
Hematocrit changes in pregnancy are typically not indicative of a serious problem but a normal physiological adaptation. Hemodilution reduces hematocrit without indicating a pathological condition.
Choice C rationale
During pregnancy, plasma volume increases by approximately 50%, while red cell mass increases by about 30%, leading to hemodilution. This physiological change results in a lower hematocrit value.
Choice D rationale
Although hematocrit decreases due to hemodilution, it does not mean that there is a deficiency in red blood cell production. It reflects the dilution effect of increased plasma volume during pregnancy.
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