Across
- 3. vein in the heart
- 5. number of hollow spaces in a human heart
- 7. fluid in the circulatory system of humans and other vertebrates
- 9. organ that cleans blood
- 10. a component of blood
- 11. hollow spaces in the heart.
Down
- 1. the upper compartments of the heart
- 2. prevents the back-flow of in the heart and in vessels
- 4. denotes cells that carry hemoglobin
- 6. liquid that contains all parts of blood
- 8. what clean blood is rich of
- 10. main action of heart