Health and fitness crossword

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Across
  1. 3. increasing the diameter of small arteries to increase blood flow
  2. 5. The gasses in air are oxygen, carbon dioxide and
  3. 6. carries blood towards the heart
  4. 8. carries blood away from the heart
Down
  1. 1. blood vessels one cell thick and have very thin walls
  2. 2. reducing the diameter of small arteries to reduce blood flow
  3. 4. _______ muscles located between the ribs
  4. 7. smoking, drinking alcohol and stress increase blood _______