The right atrium of the human heart receives blood from which of the following?

If the pacemaker is absent,what will happen?

Bradycardia indicates slow heart rate, generally below . . . . . . per minute. (in $beats$)

All the components of the conducting system can generate an action potential for the contraction of heart muscle,but the Sinoatrial node acts as the pacemaker because

Select the $INCORRECT$ statement with respect to heart sounds.

The tricuspid valve is present at the origin of