G7 Science Circulatory System Crossword

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