Cardiovascular system practice

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Across
  1. 3. Middle layer of the heart wall.
  2. 4. The type of pressure generated in the blood vessels by the heart.
  3. 8. System that creates red blood cells
  4. 9. protective sac around the heart
  5. 11. largest artery
  6. 12. In general, it is the blood vessel type that carries blood back to the heart.
  7. 14. Drains blood back to the heart from the upper regions of the body
  8. 15. White blood cells
  9. 16. It controls the timing of the heartbeat.
Down
  1. 1. A measure of the strain felt in your arteries.
  2. 2. The opening and closing of these things causes the sound of the heart
  3. 5. Upper chambers of the heart
  4. 6. Can cause low blood pressure
  5. 7. The sound the heart makes
  6. 10. Lower , external place that comes to a soft point on the heart
  7. 11. High blood pressure can cause damage to ________
  8. 13. Largest vein