Nursing Elites

1. Why is a beta-blocker prescribed to a client with a history of myocardial infarction?

• A. To reduce myocardial oxygen demand.
• B. To increase cardiac output.
• C. To prevent arrhythmias.
• D. To prevent the development of angina.

Correct answer: A

Rationale: The primary reason for administering a beta-blocker to a client with a history of myocardial infarction is to reduce myocardial oxygen demand. By reducing myocardial oxygen demand, beta-blockers help decrease the workload on the heart, making it easier for the heart to function effectively. This is crucial for clients with a history of myocardial infarction to prevent further damage to the heart. Choice B is incorrect because beta-blockers do not aim to increase cardiac output; instead, they help improve cardiac function by reducing workload. Choice C is incorrect because while beta-blockers can help prevent certain arrhythmias, the primary reason for their use in this case is to reduce myocardial oxygen demand. Choice D is incorrect as preventing angina is not the primary purpose of administering beta-blockers to a client with a history of myocardial infarction.

2. What is the primary action of bisphosphonates when prescribed to a patient with osteoporosis?

• A. It inhibits bone resorption, which helps maintain bone density.
• B. It stimulates new bone formation by increasing osteoblast activity.
• C. It increases calcium absorption in the intestines, which helps build stronger bones.
• D. It decreases calcium excretion by the kidneys, helping to maintain bone density.

Correct answer: A

Rationale: The correct answer is A: "It inhibits bone resorption, which helps maintain bone density." Bisphosphonates work by inhibiting bone resorption carried out by osteoclasts, thereby preventing the breakdown of bones and helping to maintain or increase bone density in patients with osteoporosis. Choices B, C, and D are incorrect because bisphosphonates do not directly stimulate new bone formation, increase calcium absorption in the intestines, or decrease calcium excretion by the kidneys.

3. Which of the following is a clinical manifestation of hyperthyroidism?

• A. Tachycardia
• B. Constipation
• C. Weight gain
• D. Fatigue

Correct answer: A

Rationale: The correct answer is A: Tachycardia. Tachycardia, which is an increased heart rate, is a classic clinical manifestation of hyperthyroidism. In hyperthyroidism, there is an excess production of thyroid hormones, leading to an increased metabolic rate. This increased metabolism can cause symptoms such as a rapid heart rate. Choices B, C, and D are incorrect because constipation, weight gain, and fatigue are more commonly associated with hypothyroidism, where there is a deficiency of thyroid hormones leading to a slower metabolic rate.

4. In osteoporosis, what is the expected therapeutic action of raloxifene (Evista)?

• A. It decreases bone resorption and increases bone density.
• B. It stimulates the formation of new bone.
• C. It increases calcium absorption in the intestines.
• D. It decreases the excretion of calcium through the kidneys.

Correct answer: A

Rationale: The correct answer is A. Raloxifene works by decreasing bone resorption and increasing bone density. This helps in strengthening bones, reducing the risk of fractures, and improving bone health in patients with osteoporosis. Choice B is incorrect because raloxifene does not directly stimulate the formation of new bone but rather prevents bone loss. Choice C is incorrect as raloxifene does not primarily affect calcium absorption in the intestines. Choice D is also incorrect as raloxifene does not primarily decrease the excretion of calcium through the kidneys.

5. What is the main function of the mitochondria in a cell?

• A. To produce energy in the form of ATP
• B. To synthesize proteins
• C. To store genetic information
• D. To regulate cell growth

Correct answer: A

Rationale: The correct answer is A: To produce energy in the form of ATP. Mitochondria are known as the powerhouse of the cell because they are responsible for producing energy in the form of ATP through a process called cellular respiration. This energy is essential for various cellular activities. Choice B is incorrect because protein synthesis primarily occurs in the ribosomes. Choice C is incorrect as the genetic information is stored in the cell's nucleus. Choice D is incorrect as the regulation of cell growth involves various other organelles and processes within the cell.

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