Biology, Eighth Edition (Raven)

Chapter 49: The Circulatory and Respiratory Systems

The Cardiac Cycle

View the animation below, then complete the quiz to test your knowledge of the concept.



1.

Which of the following is not true for ventricular systole?
A)the ventricles contract.
B)the atrioventricular valves close.
C)the semilunar valves open.
D)the ventricles relax.
E)blood flows through the aorta and the pulmonary trunk.
2.

The semilunar valves close during...
A)ventricular systole.
B)ventricular diastole.
C)atrial systole.
D)atrial diastole.
E)both atrial and ventricular systole.
3.

The atrioventricular valves open during...
A)ventricular systole.
B)ventricular diastole.
C)atrial systole.
D)atrial diastole.
E)both atrial and ventricular systole.
4.

Atrial contraction accounts for most of the ventricular filling.
A)True
B)False
5.

The ventricles begin to fill during ventricular diastole.
A)True
B)False
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