During the ejection phase of the cardiac cycle, blood exits the left ventricle through the
A. aorta.
B. coronary sinus.
C. pulmonary vein.
D. superior vena cava.
E. pulmonary trunk.
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Question 2) Pressure in the right ventricle must exceed pressure in the ____ before the right ventricle can eject blood.
A. superior vena cava
B. coronary sinus
C. pulmonary trunk
D. aorta
E. pulmonary veins.
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Question 3) . As soon as left ventricular pressure exceeds the pressure in the aorta, the
A. AV valves open.
B. aortic semilunar valve opens.
C. atria pump blood into the ventricles.
D. ventricles pump blood into the atria.
E. pulmonary semilunar valve closes.
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Question 4) The tricuspid valve is closed
A. during active filling of the ventricles.
B. when the mitral valve is open.
C. while the atria are contracting.
D. during ejection.
E. during passive filling of the ventricles.
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Question 5) The chamber of the heart that endures the highest pressure is the
A. right atrium.
B. left atrium.
C. right ventricle.
D. left ventricle.
E. coronary sinus.
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Question 6) During the isovolumetric contraction period of the cardiac cycle,
A. AV and semilunar valves are closed.
B. the atria are contracted.
C. ventricular volume increases.
D. blood is pumped into the large arteries.
E. pressure in the ventricles decreases.
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Question 7) In the cardiac cycle,
A. the right atrium and the right ventricle contract simultaneously.
B. the left atrium contracts before the right atrium.
C. all four chambers of the heart contract at the same time.
D. all four chambers of the heart are in diastole at the same time.
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Question 8) Blood does not enter or leave the ventricles during the period called
A. ejection.
B. rapid filling.
C. atrial systole.
D. isovolumetric contraction.
E. active and passive filling.
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Question 9) The period of isovolumetric contraction is immediately followed by
A. the period of ejection.
B. AV node depolarization.
C. passive ventricular filling.
D. atrial contraction.
E. isovolumetric relaxation.
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Question 10) When left atrial pressure exceeds left ventricular pressure,
A. left ventricular ejection begins.
B. aortic blood pressure begins to rise.
C. the bicuspid (mitral) valve opens.
D. ventricular volume decreases.
E. the tricuspid valve opens.
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