Cardiovascular System

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Across
  1. 4. A powerful muscular pump.
  2. 9. Lines the interior of the heart and heart valves.
  3. 11. Secrete factors that affect the size of blood vessels, reduce blood clotting, and promote the growth of blood vessels.
  4. 12. A fibrous and membranous sac, surrounds the heart.
  5. 13. The beat pf the heart as felt through the walls of arteries.
  6. 15. smaller branches of arteries.
Down
  1. 1. Two upper chambers of the heart.
  2. 2. Lower chambers of the heart.
  3. 3. microscopic vessels carry nutrient-rich, oxygenated blood from the arteries and arterioles to the body cells.
  4. 5. Means wall.
  5. 6. Largest single artery in the body.
  6. 7. The______ arteries supply blood to the head and neck.
  7. 8. Prevent the backflow of blood and keep the blood moving in one direction.
  8. 10. Muscular layer of the heart wall, is its thickest layer.
  9. 14. Blood pressure is extremely low compared with pressure in arteries.