1
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Circulation. It starts in the right atrium. Then it goes through the tricuspid valve to the right ventricle.

2
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Then it goes through the pulmonary valve and the pulmonary artery to the lungs.

3
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In the lungs it mixes with oxygen and it goes to the left atrium.

4
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Then it goes through the matral valve and goes to the left ventricle.

5
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Then the left ventricle pumps the blood to the rest of the body.