Across
- 2. Where the blood cells pick up oxygen
- 6. Receiving system of the heart
- 7. Blood vessels leading away from the heart
- 11. Blood vessels returning to the heart
- 12. How you can feel your heart rate
- 13. exercise that uses oxygen
- 15. Exercise __________ (speeds up) your heart rate
- 16. Nerve that slows down the heart
Down
- 1. only artery that carries oxygen-poor blood
- 3. Word that means 'blood vessels'
- 4. Word that means 'heart'
- 5. Percent of your body's blood in your arteries at any given time
- 8. What pumps the blood
- 9. Body's main artery
- 10. Blood cell that allows for clotting
- 14. muscle that is called the "second heart"