Across
- 5. Smallest blood vessel. Materials pass to and from the bloodstream through the thin capillary walls.
- 6. Partition or wall dividing a cavity; such as between the right and left atria and right and left ventricles.
- 7. Gas that enters the blood through the lungs and travels to the heart to be pumped via arteries to all body cells.
- 10. Thin-walled vessel that carries blood from body tissues and lungs back to the heart. Veins contain valves to prevent backflow of blood.
- 11. Small artery.
- 12. One of two lower chambers of the heart.
- 13. Inner lining of the heart.
- 14. Abnormal swishing sound caused by improper closure of the heart valves.
Down
- 1. Largest artery in the body.
- 2. Beat of the heart as felt through the walls of the arteries.
- 3. Double-layered membrane surrounding the heart.
- 4. Small vein.
- 8. Muscular, middle layer of the heart.
- 9. Largest type of blood vessel; carries blood away from the heart to all parts of the body.
- 10. Structure in veins or in the heart that temporarily closes an opening so that blood flows in only one direction.