Cardiovascular System Crossword

12345678
Across
  1. 2. Upper chamber of the heart that receives blood
  2. 5. Phase of the heartbeat when the heart contracts
  3. 6. Phase of the heartbeat when the heart relaxes
  4. 8. Lower chamber of the heart that pumps blood out
Down
  1. 1. The rhythmic beating felt in arteries
  2. 3. Structure that prevents blood from flowing backward
  3. 4. Largest artery that carries oxygen-rich blood to the body
  4. 7. Muscular organ that pumps blood throughout the body