A nurse is discussing fetal circulation with a group of nursing students.The ductus venosus, foramen ovale, and ductus arteriosus are key factors in fetal circulation.Which of the following explains the purpose of these shunts in fetal circulation?
To bypass the lungs and direct oxygenated blood to the brain and body.
To ensure proper development of the fetal heart.
To regulate blood pressure in the fetus.
To facilitate gas exchange in the lungs.
The Correct Answer is A
Choice A rationale
The ductus venosus, foramen ovale, and ductus arteriosus are shunts in fetal circulation that bypass the lungs and liver, directing oxygenated blood to the brain and body. The foramen ovale allows blood to flow from the right atrium to the left atrium, bypassing the lungs. The ductus arteriosus connects the pulmonary artery to the aorta, allowing blood to bypass the lungs. The ductus venosus shunts blood from the umbilical vein to the inferior vena cava, bypassing the liver.
Choice B rationale
This choice is incorrect because the primary purpose of these shunts is not to ensure proper development of the fetal heart. While they do play a role in directing blood flow, their main function is to bypass the non-functional fetal lungs and liver.
Choice C rationale
This choice is incorrect because the shunts are not primarily involved in regulating blood pressure in the fetus. Their main function is to direct oxygenated blood to vital organs like the brain and heart.
Choice D rationale
This choice is incorrect because the shunts bypass the lungs, which are not yet functional in the fetus. Gas exchange occurs in the placenta, not the fetal lungs.
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Correct Answer is D
Explanation
Choice A rationale
Striae gravidarum, or stretch marks, are a common occurrence during pregnancy due to the rapid stretching of the skin. They are not a medical emergency and do not require immediate attention from a healthcare provider.
Choice B rationale
During pregnancy, the nipples and areola typically become darker, not paler, as the breasts enlarge. This change is due to hormonal influences and increased blood flow to the area.
Choice C rationale
Fetal movement, also known as quickening, is usually felt by the mother between 18 to 25 weeks of gestation, not as early as 10 weeks. At 10 weeks, the fetus is still too small for its movements to be felt by the mother.
Choice D rationale
Some nausea and vomiting, known as morning sickness, is normal during pregnancy. However, if a pregnant woman is unable to keep food or water down, it is important to contact a healthcare provider to ensure she and the baby are receiving adequate nutrition and hydration.
Correct Answer is C
Explanation
Choice A rationale
Intimate partner violence (IPV) does not necessarily decrease during pregnancy. In fact, pregnancy can sometimes increase the risk of IPV due to various stressors and changes in the relationship dynamics.
Choice B rationale
IPV consists of more than just physical abuse. It can also include emotional, psychological, and sexual abuse. Emotional abuse can involve manipulation, threats, and controlling behavior, while sexual abuse includes any non-consensual sexual activity.
Choice C rationale
IPV can indeed include emotional, physical, and sexual abuse. This comprehensive understanding is crucial for recognizing and addressing all forms of IPV, as each type can have severe and lasting impacts on the victim’s health and well-being.
Choice D rationale
IPV is not rare; it is a common issue affecting millions of people worldwide. It can occur in any demographic and socioeconomic group, making it a significant public health concern.