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DHA Critical Care Nurse (DHA-CriticalCare) Practice Exams & Test Prep - Free Test


Our free DHA Critical Care Nurse (DHA-CriticalCare) Practice Test was created by experienced educators who designed them to align with the official Dubai Health Authority content guidelines. They were built to accurately mirror the real exam's structure, coverage of topics, difficulty, and types of questions.

Upon completing your free practice test, it will be instantly reviewed to give you an idea of your score and potential performance on the actual test. Carefully study your feedback to each question to assess whether your responses were correct or incorrect. This is an effective way to highlight your strengths and weaknesses across different content areas, guiding you on where to concentrate your study efforts for improvement on future tests. Our detailed explanations will provide the information you need to enhance your understanding of the exam content and help you build your knowledge base leading you to better test results.

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DHA Critical Care Nurse - Free Test Sample Questions

Most calcium channel blockers work by blocking calcium ion channels in the plasma membranes of what?

Correct Answer:
smooth muscle.


calcium channel blockers are a class of medications that primarily target the smooth muscles in the walls of arteries. these drugs function by inhibiting the influx of calcium ions through specific channels in the plasma membranes of smooth muscle cells.

calcium ions play a critical role in the contraction mechanisms of muscle cells, including smooth muscles, which are found in the walls of arteries and arterioles. by blocking calcium channels, these medications prevent calcium from entering the cells, thus reducing muscular contraction. this relaxation of the vascular smooth muscle leads to a dilation of the blood vessels, which in turn lowers blood pressure and reduces the strain on the heart.

the impact of calcium channel blockers is more pronounced on arterial smooth muscle compared to venous smooth muscle. this selective action is beneficial in treating conditions like hypertension (high blood pressure) and angina (chest pain caused by reduced blood flow to the heart muscle), as these conditions primarily involve the arteries rather than the veins.

while calcium channel blockers are effective in targeting vascular smooth muscle, they have lesser effects on other types of muscle tissues, such as striated muscle, which includes skeletal and cardiac muscle. similarly, these drugs do not significantly affect nerve tissue or epithelial tissue, both of which have different mechanisms and roles in the body.

understanding the specific action of calcium channel blockers on vascular smooth muscle helps in their appropriate application in clinical settings, ensuring that they are used effectively to manage specific cardiovascular conditions.