MEHAU KULYK / SCIENCE PHOTO LIBRARY MEHAU KULYK / SCIENCE PHOTO LIBRARY
Heart and ECG (electrocardiogram) trace, computer artwork. The heart is a hollow muscle that pumps blood around the body. Deoxygenated blood from the body is carried into the right side of the heart (left) via the vena cava (cut vessel left of arch). From here, the blood travels into the lungs via the pulmonary artery (right), where it is oxygenated. The blood is then carried into the left side of the heart (right) before travelling back into the body via the aorta (arch), where it can exchange oxygen for carbon dioxide and start the cycle all over again. An ECG measure the electrical activity of the heart. Contractions are caused by electrical signals between the upper (atrial) and lower (ventricle) chambers. The tall peak indicates the pumping of the ventricles.
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