Across
- 3. Tiny blood vessels with very thin walls for diffusion
- 5. The muscular organ that pumps blood around the body
- 8. What the heart acts as in the circulatory system
- 10. Particles move from high concentration to ______ concentration
- 14. The system that transports oxygen and nutrients around the body
- 15. Arteries, veins, and capillaries are types of blood ______
- 16. Movement of particles from high to low concentration
- 17. Substances carried in blood that cells need for energy
Down
- 1. The transport liquid of the circulatory system
- 2. The main function of the circulatory system
- 4. Blood leaves the heart at ______ pressure in arteries
- 6. Blood vessels that carry blood away from the heart
- 7. The force created by the heart to move blood
- 9. The heart is made of this type of tissue
- 11. Gas transported by blood to body cells
- 12. Structures in veins that prevent blood flowing backwards
- 13. Blood vessels that carry blood back to the heart