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1. heart e. an inner hollow muscular organ that pumps blood to our body

2. apex c. the lowest tip of the heart

3. pericardium g. a double-walled sac that encloses the heart.

4. septum b. a partition between the right and left sides of the heart

5. atrium a. the upper chamber of the heart

6. ventricle f. the lower chamber of the heart that receives blood from the upper chamber (atrium)

7. artery d. the largest tube of blood vessel that carries blood away from the heart to all parts of the body