Cardiology Quiz #5: Cardiovascular Physiology

1. A 30-year-old woman with a history of anxiety comes to the physician complaining of palpitations. She denies the use of caffeine or illicit drugs. An ECG is performed and shows normal sinus rhythm with a heart rate of 110 bpm. Which of the following best describes the primary mechanism responsible for her increased heart rate? 

Question 1 of 5

2. A 65-year-old male with a history of hypertension is being evaluated for heart failure. An echocardiogram shows decreased ejection fraction. Which of the following changes is most likely to occur as a compensatory mechanism in this patient? 

Question 2 of 5

3. During a physiology lecture, a professor explains the concept of afterload. Which of the following best defines afterload? 

Question 3 of 5

4. A 22-year-old male collapses while running a marathon. He is brought to the emergency department where he is found to be hypotensive and tachycardic. Which of the following physiological responses is most likely to occur in this patient to maintain cardiac output? 

Question 4 of 5

5. A study is conducted to assess the effects of different body positions on venous return. Which of the following positions is most likely to increase preload and venous return in a healthy individual? 

Question 5 of 5


 

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