Across
- 2. Partition or wall dividing a cavity of the heart
- 4. Muscular middle layer of the heart
- 7. A waste product released by body cells
- 9. Structure in the veins or heart that temporarily closes an opening so that blood flows in only one direction
- 10. Gas that enters the blood through the lungs and travels to the heart to be pumped
- 11. Found between left atrium and left ventricle
- 12. 1 of 2 upper chambers of the heart
- 13. Large blood vessels that carry blood away from the heart
- 14. Innermost layer of epithelial cells
Down
- 1. Pathway of blood from the heart to the tissue capillaries and back to the heart
- 3. Beat of the heart
- 5. Double-layered membrane surrounding the heart
- 6. Oxygen-rich blood
- 8. The pathway of blood through the vessels from the heart to the lungs and then back to the heart again heart to the lungs
- 9. Small vein