Caption: Electrical conduction in the heart in healthy individuals is controlled by pacemaker cells in the sinoatrial node.
Artist: Encyclopaedia Britannica
Release: Not Applicable
File Size: 38.43 MB

Caption: Electrocardiogram of the alternating contractions during one heartbeat and a diagram of the heart's impulse-conducting system.
Artist: Encyclopaedia Britannica
Release: Not Applicable
File Size: 24.12 MB

Caption: human protected by doctor and insurance agent
Artist: Fanatic Studio
Release: Not Applicable
File Size: 51.68 MB