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Bitmap Image  |  1997-10-24  |  27KB  |  365x230  |  8-bit (78 colors)
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OCR: Semilunar valve X With each heartbeat, blood surges out of your heart into your arteries. These large, tough blood vessels then carry the blood around your body. As the blood leaves your heart, it passes through a semilunar valve, which is shaped like a half-moon. The valve then closes to stop the blood flowing back into your heart.