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- The ________(1) is the organ in the human body that pumps blood to all the other organs, tissues, and cells. The heart is made up of four _______(2) chambers and valves. The right _______(3) receives deoxygenated blood from the body and pumps it to the lungs. The lungs add _______(4) to the blood and send it back to the heart. From there, the left _______(5) pumps the oxygen-rich blood out to the rest of the body. Within the heart are four valves _______(6) open and close to regulate the flow of blood. They are the mitral, tricuspid, pulmonary, and _______(7). The heart is controlled by an internal _______(8) system.
- 1. Heart
- 2. Separate
- 3. Atrium
- 4. Oxygen
- 5. Ventricle
- 6. that
- 7. Aortic
- 8. electrical
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