A&P Elaborate Exam Study Questions with Verified Answers Already Graded A+

A&P Elaborate Exam Study Questions with Verified Answers Already Graded A+ 1. What heart diagnostic procedure uses sound waves to create a moving picture of the heart? A) CT/MRI angiography. B) electrocardiogram C) echocardiogram. D) electron-beam computed tomography (EBCT). - ANSWER C) echocardiogram. 2. What percentage of myocardial infarction patients demonstrate arrhythmias? A) 40%. B) 60%. C) 75%. D) 90%. - ANSWER D) 90%. 3. A person notices his or her heart beat because he or she senses blood being pumped by the heart. Excessive caffeine intake can lead to irregular heart rhythms (arrhythmias) that patients perceive as "skipped beats." Given that caffeine is a stimulant, which of the following mechanisms best explains the reason for the feeling that the heart skipped a beat? A) Action potentials are not delayed sufficiently at the AV node. B) Action potentials propagate into the ventricles before the contractile cells have repolarized from the previous heartbeat. C) Purkinje fibers initiate spontaneous action potentials, which cause the ventricles to contract early. D) Spontaneous action potentials in the SA node overlap such that the repolarizing phase of one action potential cancels out the depolarizing phase of the next. - ANSWER C) Purkinje fibers initiate spontaneous action potentials, which cause the ventricles to contract early. 4. The beginning of the QRS complex of the electrocardiogram (ECG) immediately precedes which of the following events? A) closing of the atrioventricular valves B) atrial contraction C) closing of the semilunar valves D) blood ejection from the ventricles - ANSWER A) closing of the atrioventricular valves 5. Which part of the intrinsic conduction system normally initiates the depolarizing impulse that causes a heartbeat? A) SA node B) AV bundle C) AV node D) Internodal pathway - ANSWER A) SA node 6. Arrange these elements of the intrinsic conduction system in the order that a depolarizing impulse travels during a normal heartbeat. - ANSWER 1) SA node 2) Internodal pathways 3) AV node 4) AV bundle 5) Bundle branches 6) Purkinje fibers 7. Chest pain (angina) is associated with myocardial _____________. A) infarction. B) necrosis. C) ischemia. D) hemorrhage - ANSWER C) ischemia. 8. Which of the following best describes the arterial lesion associated with atherosclerosis? A) atheroma. B) aneurysm. C) hemmorhage. D) dissection. - ANSWER A) atheroma. 9. Which of the following is a reversible event? A) hypoxia. B) occlusion. C) necrosis. D) coagulation cascade. - ANSWER A) hypoxia. 10. Daily use of low-dose aspirin helps to reduce: A) blood cholesterol. B) hypertension. C) blood clots. D) angina. - ANSWER C) blood clots. 11. Which of these structures conduct(s) action potentials the slowest? A) Bundle branches B) AV bundle C) AV node D) Purkinje fibers - ANSWER C) AV node 12. Which of the following can be heard with a stethoscope most easily? A) Closing of atrioventricular valves B) Contraction of atria C) Blood flow into aorta D) Isovolumetric contraction - ANSWER A) Closing of atrioventricular valves