The heart is a muscular pump with four chambers: two upper chambers called atria, and two lower chambers called ventricles. These chambers are hollow and surrounded by muscle and other tissue.

Each side of the heart consists of an atrium and a ventricle which are two connected chambers. The atria (plural of atrium) are where the blood collects when it enters the heart. The ventricles ...

This represents the time that it takes for the electrical impulse generated in the sinus node to travel through the atria and across the atrioventricular node to the ventricles. The normal PR ...

This is termed “AV dissociation.” In this situation, the ventricles never see action potentials originating from the atria and compensate by making action potentials of their own. However ...

round P wave as electricity stimulates the atria. The P waves are followed by a period of no activity, or PR interval, before sharp waves of activity in the ventricles, or QRS waves. With Mobitz ...

Each side of the heart consists of an atrium and a ventricle which are two connected chambers. The atria (plural of atrium) are where the blood collects when it enters the heart. The ventricles ...