ROGER HARRIS / SCIENCE PHOTO LIBRARY ROGER HARRIS / SCIENCE PHOTO LIBRARY
Heart, computer artwork. The heart is a hollow sac of muscular tissue that pumps blood around the body. The aorta (large artery, upper left) carries blood to the body. Three smaller arteries are seen branching off it. To the left of the aorta is part of the vena cava vein (the upper section). This vein carries deoxygenated blood into the heart from the body. This blood then travels from the heart to the lungs (where it obtains oxygen) and back to the heart through the pulmonary blood vessels (upper right). The oxygenated blood is then pumped into the aorta and around the body.
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