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Blood is pumped continuously around the body's circulatory system. It is pumped in a continuous flow from the heart through the arteries, then through the tiny capillaries and back through the veins to the heart.

Electrical signals

An electrocardiogram, or ECG, measures the electrical signals that the heart produces as it beats. These signals change when a person is suffering from certain medical conditions that affect the heart. The signals can be measured by attaching wires to the chest read more...

Tags: heart, body, blood, substance, arteries

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