The heart pumps blood around the body and has four chambers. The atria are at the top, and the ventricles are at the bottom. Typically, electrical signals travel from the atria to the ventricles ...

It starts in the sinus node, located in the right atrium, and travels through both atria to stimulate contraction. It then goes to the atrioventricular node and travels toward the ventricles to ...

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 ...

The heart has two upper chambers, called atria, which move blood to the lower chambers, called ventricles, which then pump the blood to the lungs and the rest of the body. Heartbeats are ...

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 ...