In a newborn infant, which of the following is the liver's job related to bilirubin?
Changing conjugated bilirubin to unconjugated.
Synthesis of vitamin K.
Changing unconjugated bilirubin to conjugated bilirubin.
Removal of meconium.
The Correct Answer is C
Choice A rationale:
The liver's job related to bilirubin is not changing conjugated bilirubin to unconjugated. Conjugated bilirubin is the water-soluble form of bilirubin that is excreted in bile and urine. Unconjugated bilirubin, on the other hand, is the fat-soluble form, which is transported to the liver and conjugated to become water-soluble. The conversion goes from unconjugated to conjugated, not the other way around.
Choice B rationale:
The liver's job related to bilirubin is not the synthesis of vitamin K. The liver is responsible for synthesizing clotting factors, including factors II (prothrombin), VII, IX, and X, but not vitamin K itself. Vitamin K is obtained from dietary sources or supplements and is essential for blood clotting.
Choice C rationale:
This choice is the correct answer. The liver's primary function related to bilirubin is changing unconjugated bilirubin to conjugated bilirubin. As mentioned earlier, unconjugated bilirubin is produced from the breakdown of heme in old red blood cells, and it needs to be processed in the liver to become water-soluble and eventually excreted in bile and urine.
Choice D rationale:
The liver's job related to bilirubin does not involve the removal of meconium. Meconium is the first stool passed by a newborn, and its elimination is unrelated to the liver's function in processing bilirubin.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B
Explanation
Choice A rationale:
Providing a heat source for the newborn is not the purpose of surfactant. Surfactant is a substance produced in the lungs to reduce surface tension and prevent alveolar collapse during expiration. It helps with the exchange of gases, but it does not generate heat.
Choice B rationale:
This is the correct answer. Surfactant plays a crucial role in assisting the alveoli to remain open by reducing surface tension. This, in turn, allows for proper gas exchange, especially of oxygen and carbon dioxide.
Choice C rationale:
Assisting the ductus arteriosus to remain open is not the purpose of surfactant. The ductus arteriosus is a fetal blood vessel that connects the pulmonary artery to the aorta, bypassing the lungs. After birth, it should close on its own, and surfactant does not influence this process.
Choice D rationale:
Providing energy to the newborn is not the purpose of surfactant. Energy for the newborn comes from nutrition, particularly breast milk or formula, and not from surfactant
Correct Answer is ["The medical term for the soft spot on a baby's skull is fontanelle (or fontanel)."]
Explanation
The medical term for the soft spot on a baby's skull is fontanelle (or fontanel). Fontanelles are gaps between the bones of the skull that allow for the baby's brain to grow and accommodate rapid brain development during infancy. There are typically two fontanelles in a newborn's skull: the anterior fontanelle (located at the top/front of the head) and the posterior fontanelle (located at the back of the head). These fontanelles are composed of connective tissue and remain open during the early months of life, gradually closing as the baby's skull bones fuse together over time. Healthcare professionals often assess fontanelles during routine physical exams of infants. The fontanelle's size and tension can provide valuable information about the baby's hydration status, intracranial pressure, and neurological development.
Normally, the fontanelles should feel relatively soft and flat, indicating proper hydration and brain development. If the fontanelles are sunken or overly tense, it may suggest dehydration or increased intracranial pressure, which requires further evaluation and management. The proper examination of fontanelles is an essential part of newborn care, and any abnormalities observed during assessment should be promptly reported to the healthcare provider for appropriate evaluation and intervention.
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