Across
- 5. largest artery in your body
- 7. the number of times your heart beats per minute is your heart ____.
- 8. the liquid part of the blood
- 10. blood flows in only ___ direction
- 11. William ____ was the first person to understand how blood circulates
- 12. ____ blood cells that carry oxygen to all the parts of your body
- 14. hollow organ with walls made of strong muscle
- 15. bean-shaped organs that clean your blood
Down
- 1. there are ____ main blood types
- 2. blood vessels connecting arteries and veins
- 3. blood vessels that carry blood away from the heart
- 4. small flap of tissue that stops blood from flowing backwards
- 6. blood vessels that carry blood to the heart
- 8. the push of blood through your vessels as your heart beats
- 9. help form blood clots
- 13. ____ blood cells help the body fight infection