The sac around the heart is called the

The receiving chambers of the heart are the

Blood returns to the heart from the body through the

The valve between the L atrium and L ventricle is the

The semilunar valves are the

The vessels that supply the heart with oxygen rich blood are the

The pacemaker of the heart is the

Before entering the L atrium blood was in the

During R ventricular systole, blood passes through the

During ventricular diastole which valves are closed?

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