Cardiology Quiz #20: Autoregulation of Cardiovascular System

1. A 55-year-old man with a history of hypertension is undergoing a treadmill stress test. During the test, his blood flow to the heart muscle increases. Which of the following mechanisms primarily accounts for the increased myocardial blood flow during exercise? 

Question 1 of 5

2. A researcher is studying the effects of autoregulation on cerebral blood flow in response to changes in arterial blood pressure. Which of the following outcomes would most likely be observed if arterial blood pressure were decreased within the autoregulatory range? 

Question 2 of 5

3. A patient with chronic kidney disease experiences a significant reduction in renal blood flow due to dehydration. Despite this, the glomerular filtration rate (GFR) remains relatively stable. Which of the following best explains the maintenance of GFR under these conditions? 

Question 3 of 5

4. A pharmacology student is studying the effects of various drugs on blood flow in different vascular beds. Which of the following drugs would most likely reduce the ability of skeletal muscles to increase blood flow during exercise by interfering with local autoregulatory mechanisms? 

Question 4 of 5

5. A 70-year-old woman with a history of diabetes mellitus type 2 and peripheral artery disease presents to her physician complaining of leg pain when walking. The physician explains that the pain is due to inadequate blood supply to her leg muscles during exertion, a condition known as claudication. Which of the following underlying mechanisms is most likely responsible for her symptoms? 

Question 5 of 5


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