FRANCIS LEROY, BIOCOSMOS / SCIENCE PHOTO LIBRARY FRANCIS LEROY, BIOCOSMOS / SCIENCE PHOTO LIBRARY
Heart anatomy. Artwork showing the flow of blood through the heart. The heart is a hollow muscle that pumps blood around the body. Deoxygenated blood (black arrows) from the body is carried into the right side of the heart (left) via the vena cava. From here the blood travels into the lungs via the pulmonary artery (rightmost red arrow), where it is oxygenated. The oxygenated blood (three red arrows) is then carried into the left side of the heart (right) before travelling back into the body via the aorta (top centre of right-hand heart). In the body the blood exchanges oxygen for carbon dioxide and the cycle starts all over again.
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