Depending on the degree of the sinoatrial block, the electrical impulses may or may not move from the atria and reach the ventricles. Individuals affected by a sinoatrial block are asymptomatic ...

Common signs of Wenckebach heart block are feeling dizzy, tired, and having a fast heartbeat. These signs can be hard to ...

Your heart is made up of two atria and two ventricles. Typically, the signal for your heartbeat starts in the right atrium in the sinoatrial node and travels to both the left and right ventricles ...

This stimulates the upper chambers (left and right atria) to contract to pump blood down to the lower chambers (ventricles).

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 ...

Following the blood through one complete circulation of the body: Note that although this is shown as a sequence, the atria contract in unison, and when full, the ventricles also contract in unison.