Across
- 4. Substance within red blood cells that helps it to carry oxygen
- 6. Fragments of cells that are involved in blood clotting
- 8. Waste product produced in all cells
- 11. Narrow arteries within the heart muscle itself
- 12. Separates the left and right sides of the heart
- 13. Prevents backflow of blood
- 14. Narrow tube carrying air in the lungs
- 16. The process by which oxygen enters the bloodstream
- 17. Chamber of the heart connected directly to the vena cava
- 19. Type of cell that produces antibodies
Down
- 1. Type of tissue in the walls of an artery
- 2. The part of the blood that glucose is carried in
- 3. Narrow blood vessel that is specialised for exchange of materials
- 5. Chemical reaction that releases energy
- 7. Chamber of the heart with the thickest walls
- 9. Shape of a red blood cell
- 10. Prevents the trachea from collapsing
- 13. A blood vessel that carries blood towards the heart
- 15. The largest artery in the body
- 18. Small air sac