Biology revision

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Across
  1. 6. pacemaker of the heart
  2. 7. a type of neuron that causes movement
  3. 10. a chronic lung condition
  4. 11. where T cells mature
  5. 14. protective sac around the heart
  6. 15. command centre of the cell
  7. 17. the loop of Henle is found here
Down
  1. 1. a nerve cell
  2. 2. digestive enzyme found in saliva
  3. 3. process of cell division
  4. 4. storage place for bile
  5. 5. a bone of the lower leg
  6. 8. compound required for bone development
  7. 9. hormone secreted by the pancreas
  8. 12. white blood cells that engulf pathogens
  9. 13. valve between the left atrium and ventricle
  10. 15. millions of these are in the kidney
  11. 16. the largest organ in the body