SAMANTHA ELMHURST / SCIENCE PHOTO LIBRARY SAMANTHA ELMHURST / SCIENCE PHOTO LIBRARY
Illustration of the human body showing the heart. The heart is a muscular organ that pumps blood around the body. Seen branching from the aortic arch above the heart are the right and left common carotid arteries that supply the head and neck, and the right and left subclavian arteries that supply the arms.
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