Blood passes through the 4 chambers in this sequence:
- right atrium
- right ventricle
- left atrium
- left ventricle
1) blood flows into the two atria from the vena cava and pulmonary vein.
2) the atria contract pushing the blood into the ventricles
3) the ventricles contract forcing the blood into the pulomary artey and the aorta, and out of the heart
4) blood then flows to the organs through arteries and back to the heart through veins
5) the atria fill again and the whole cycle starts again.
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