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506947
Caption: Approaching the speed of light, an object appears shorter, with a longer time interval, relative to its intervals when at rest
Artist: Encyclopaedia Britannica
Release: Not Applicable
File Size: 32.21 MB
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481297
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
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481376
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