Heart

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Across
  1. 3. There are four of these in the heart. They stop the back flow of blood.
  2. 4. These take oxygenated blood away from the heart to the body/working muscles. They have thick, muscular walls
  3. 5. Is the waste gas, which is exhaled. It is not needed by the body.
  4. 9. Is the only cardiac muscle in the body. Its function is to pump blood around the body.
  5. 10. This is a red substance which carries oxygen and removes carbon dioxide.
Down
  1. 1. The largest blood vessel in the body. It takes blood from the heart to the rest of the body.
  2. 2. Is an organ which allows oxygen to be exchanged into the blood and carbon dioxide to be removed.
  3. 3. There are two of these in the heart. They are the larger chambers.
  4. 6. These are two small chambers, located at the top of the heart.
  5. 7. It is the gas which is needed by the body. It is used by the muscles.
  6. 8. These carry deoxygenated blood towards the heart. They contain valves and have thin walls.