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 ...

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 ...

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