Crossword on circulatory system

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Across
  1. 2. Produces antibodies that help to remove the bacteria during an infection
  2. 4. This blood vessel has thick muscular walls to withstand high blood pressure from the heart.
  3. 5. Valves are found in this blood vessel to ensure that blood flow is in one direction.
  4. 7. Blood needs to transport this gas to all parts of the body.
  5. 8. Substances that form in blood vessels that causes blockage.
  6. 10. If artery that is supply oxygen to heart is blocked, one will suffer from this condition.
  7. 11. Help to stop bleeding at wounds by clotting blood.
  8. 12. If artery that supplies oxygen to brain is blocked, one will suffer from this condition.
Down
  1. 1. This blood vessel has a one-cell thick wall to allow for efficient exchange of gases.
  2. 3. Gas that is removed from respiring cells.
  3. 6. Contains haemoglobin that binds to oxygen and transport oxygen to all parts of the body.
  4. 9. Muscle that pumps blood to all around your body.