The heart has four chambers: two atria and two ventricles.
- The right atrium receives oxygen-poor blood from the body and pumps it to the right ventricle.
- The right ventricle pumps the oxygen-poor blood to the lungs.
- The left atrium receives oxygen-rich blood from the lungs and pumps it to the left ventricle.
- The left ventricle pumps the oxygen-rich blood to the body.
| By | Healthwise Staff |
| Primary Medical Reviewer | William H. Blahd, Jr., MD, FACEP - Emergency Medicine |
| Specialist Medical Reviewer | David Messenger, MD |
| Last Revised | April 18, 2011 |
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