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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

          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

$27. During which phase of the cardiac cycle are all four heart valves open? A. ventricular filling B. isovolumetric contraction C. ventricular ejection D. isovolumetric relaxation E. none of the phases 28. The increase in ventricular volume early in diastole reflects the A. increased stiffness of the heart. B. contraction of the atria moving blood into the ventricle. C. passive movement of blood through the atrium and into the ventricle. D. relaxation of the ventricle. E. back-flow of blood from the aorta. 29. Cardiac output is determined by what two variables? A. heart rate and stroke volume B. end-diastolic volume and end-systolic volume C. stroke volume and ejection fraction D. heart rate and ejection fraction E. preload and afterload 30. The mitral valve (bicuspid valve) separates what chamber from its associated ventricle? A. right atrium B. left ventricle C. left atrium D. right ventricle E. AV bundle (bundle of His) 31. Which component of an ECG represents ventricular systole? A. P wave B. P-R interval C. T wave D. Q-T interval E. QRS complex 32. The second heart sound coincides with the beginning of which period in the cardiac cycle? A. atrial contraction B. ventricular filling C. isovolumetric contraction D. isovolumetric relaxation E. ventricular ejection$

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