1. gas that enters the blood through the lungs 2. smallest blood vessel 3. relaxation phase of the heartbeat 4. upper chamber of the heart 5. gas released by body cells; travels via blood to the lungs where it is exhaled. 6. small artery 7. inner lining of the heart 8. specialized muscle fibers connecting the upper and lower heart chambers; bundle of his 9. contraction phase of the heartbeat 10. largest artery in the body 11. lower tip of the heart



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