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The World Around Us!
Mammals have about 60,000 miles of blood vessels. They have a four chambered heart two chambers are the right an the left atrium and the other two is the right and the left ventricle. the spleen destroys or recycles old red blood cells. The right side of the heart pumped dirty blood to the lungs called the pulmonary. The left side of the heart pumps clean blood that is filled with oxygen through out the body which is systemic.
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