Science

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Across
  1. 4. attach muscles to bones
  2. 6. were two or more bones connect
  3. 9. carries oxygen and nutrients to all body cells carries away waste
  4. 10. moves food through your digestive system moves blood in blood vessels
  5. 13. tough hard bone contains bone cells and blood vessels
  6. 15. thin membrane covers and protects bones
Down
  1. 1. structure between the atrium and the ventricle to prevent backward flow of blood
  2. 2. air sacks at the end of bronchioli, they increase the surface area.
  3. 3. break down waste food particles and worn out organelles
  4. 5. connective tissue connects bone to bone at joints
  5. 7. porous light weight bone
  6. 8. convert food into energy called cellular respiration, it has its own DNA and double layered membrane
  7. 11. tough flexible connective tissue covers ends of the bones acts as a shock absorber
  8. 12. muscle that increases chest cavity
  9. 14. blood vessels that bring blood back to the heart