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Home > All Images > 1991 > January > 9 Jan 1991

Images Dated 9th January 1991

Choose from 17 pictures in our Images Dated 9th January 1991 collection for your Wall Art or Photo Gift. All professionally made for Quick Shipping.


Computer illustration of a healthy heartbeat Featured 9 Jan 1991 Print

Computer illustration of a healthy heartbeat

Heart trace. Computer illustration of the trace of a normal human pulse, the beat of the heart. The image is based on an electrocardiogram (ECG) trace, a record of the electrical activity within the heart as it beats. The large "spike", called QRS waves in ECG jargon, represents the activity of the ventricles during contraction

© MEHAU KULYK/SCIENCE PHOTO LIBRARY