Which pathology of autonomic cardiac regulation is mediated by sympathetic innervation?
Increased Ca+ influx with sympathetic stimulation that raises the heart rate.
Sympathetic activation boosts K+ efflux and increases the inotropic effect.
Sympathetic activation decreases dromotrophy by lowering conduction speed.
Increased Na+ influx with sympathetic stimulation reduces pacemaker firing.’
The Correct Answer is A
Choice A: Increased Ca+ influx with sympathetic stimulation that raises the heart rate is a manifestation of sympathetic innervation. Sympathetic activation leads to the release of norepinephrine, which enhances the influx of calcium ions (Ca+) into cardiac muscle cells, resulting in increased contractility and heart rate.
Choice B: Sympathetic activation does increase the inotropic effect (contractility) of the heart, but it is primarily mediated by the increased influx of calcium ions (Ca+).
Choice C: Sympathetic activation does not decrease dromotrophy (conduction speed). Instead, it can increase the conduction speed through the cardiac conduction system.
Choice D: Increased Na+ influx with sympathetic stimulation does not reduce pacemaker firing; instead, it contributes to the enhanced excitability and automaticity of cardiac cells.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is D
Explanation
Choice A: Checking mental acuity is important for assessing the client's cognitive function, but it may not be the most crucial intervention in the context of left- sided heart failure.
Choice B: Measuring urinary output is a valuable assessment in clients with heart failure, but it is not the most important intervention among the choices provided.
Choice C: Inspecting for sacral edema is a relevant assessment for clients with heart failure, especially when assessing for fluid retention. However, it may not be the highest priority in this case.
Choice D: Auscultating all lung fields is the most important intervention for a client with left-sided heart failure. Left-sided heart failure often results in pulmonary congestion, and auscultating the lung fields can provide critical information about the presence of crackles, wheezes, or other abnormal breath sounds, indicating worsening heart failure.
Correct Answer is B
Explanation
Choice A: Sweaty palms may be related to various factors, including anxiety, physical activity, or environmental conditions. While it may warrant further assessment, it is not necessarily indicative of a nutritional issue in a professional dancer.
Choice B: Fatigue in a professional dancer can be a concerning issue and may indicate an underlying nutritional problem, such as inadequate calorie intake or nutrient deficiencies. Further assessment of the client's dietary habits and energy levels is warranted.
Choice C: Bunions are a foot deformity and are not directly related to nutritional assessment.
Choice D: Dry skin may be related to various factors, including environmental conditions and skin care practices. It may warrant assessment but is not necessarily indicative of a nutritional issue.
Whether you are a student looking to ace your exams or a practicing nurse seeking to enhance your expertise , our nursing education contents will empower you with the confidence and competence to make a difference in the lives of patients and become a respected leader in the healthcare field.
Visit Naxlex, invest in your future and unlock endless possibilities with our unparalleled nursing education contents today
Report Wrong Answer on the Current Question
Do you disagree with the answer? If yes, what is your expected answer? Explain.
Kindly be descriptive with the issue you are facing.