What is the stroke volume? the amount of pressure in the aorta that must be overcome during ventricular Ejection the amount of blood ejected from a ventricle in one contraction the amount of blood in the ventricles at the end of systole the liters of blood pumped per minute by a ventricle the amount of blood in the ventricles at the end of diastole Question 4 What is occurring during the ventricular ejection phase of the cardiac cycle? The AV valves are open and the semilunar valves are closed as ventricular pressure is increasing. The AV valves are closed and the semilunar valves are open as blood is leaving the ventricies. The AV and semilunar valves are closed as ventricular pressure is increasing. The AV valves are open and the semilunar valves are closed as blood is leaving the ventricles. The AV and semilunar valves are open as blood is leaving the ventricles. 0.5 pts
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What is the stroke volume? The stroke volume is the amount of blood ejected from a ventricle in one contraction. Show more…
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B. Closing of the AV valves C. Opening of the semilunar valves D. Closing of the semilunar valves E. Tearing of the valves 14. The second heart sound A. Occurs while the mitral and tricuspid valves are opening B. Occurs at the beginning of ventricular systole C. Is a result of the closure of the semilunar valves D. Occurs when the pressure in the ventricle exceeds that in the aorta and pulmonary artery E. All of the above 15. Cardiac output (CO) is best expressed by which of the following equations? A. CO = Heart rate + stroke volume B. CO = Heart rate – stroke volume C. CO = Heart rate X stroke volume D. CO = Heart rate divided by stroke volume E. All of the above 16. Which one of the following accounts for the dicrotic notch of the cardiac cycle? A. Opening of the tricuspid valve B. Closing of the bicuspid valve C. Opening of the aortic semilunar valve D. Closing of the pulmonary trunk semilunar valve E. None of the above 17. Systole is the name of the period during A. Ventricular contraction B. Atrial contraction C. Ventricular relaxation D. Atrial relaxation E. The time the heart stops beating 18. The first event in the development of atherosclerosis is A. High blood pressure B. Plaque formation C. Damage to the endothelial lining the artery D. Thrombus formation 19. In which of the following locations is there no valve? A. Between the left atrium and left ventricle B. Between the left ventricle and aorta C. Between the right atrium and right ventricle D. Between the pulmonary veins and left atrium E. None of the above
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27. During which phase of the cardiac cycle are all four heart valves open? A. ventricular filling B. isovolumetric contraction C. ventricular ejection D. isovolumetric relaxation E. none of the phases 28. The increase in ventricular volume early in diastole reflects the A. increased stiffness of the heart. B. contraction of the atria moving blood into the ventricle. C. passive movement of blood through the atrium and into the ventricle. D. relaxation of the ventricle. E. back-flow of blood from the aorta. 29. Cardiac output is determined by what two variables? A. heart rate and stroke volume B. end-diastolic volume and end-systolic volume C. stroke volume and ejection fraction D. heart rate and ejection fraction E. preload and afterload 30. The mitral valve (bicuspid valve) separates what chamber from its associated ventricle? A. right atrium B. left ventricle C. left atrium D. right ventricle E. AV bundle (bundle of His) 31. Which component of an ECG represents ventricular systole? A. P wave B. P-R interval C. T wave D. Q-T interval E. QRS complex 32. The second heart sound coincides with the beginning of which period in the cardiac cycle? A. atrial contraction B. ventricular filling C. isovolumetric contraction D. isovolumetric relaxation E. ventricular ejection
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