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