Parts of the body 1

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Across
  1. 4. A bag (7)
  2. 6. Similar to 1 across, but in the arm (5)
  3. 7. They carry blood to 11 across (5)
  4. 9. It cleans your blood (6)
  5. 11. The hard part of a finger or toe (4)
  6. 12. Breathing organs (5)
  7. 14. Finger joints (8)
  8. 16. The first part of the small intestine (8)
  9. 17. At the end of your arm (4)
  10. 19. Without arms, legs or head (5)
  11. 21. The upper chambers of 18 across (5)
  12. 22. See you (3)
  13. 24. A major artery (5)
  14. 25. The major detoxicating organ (5)
  15. 27. It keeps your outside in (4)
  16. 28. Cavity in 16 down (5)
Down
  1. 1. Cheekbone (6)
  2. 2. A substance which stores energy (3)
  3. 3. An organ which secretes substances which act elsewhere in the body (5)
  4. 5. It grows on your head (4)
  5. 8. Protects the brain (5)
  6. 10. Cell in the nervous system which transmits impulses (6)
  7. 13. Type of nerve ending (8)
  8. 15. The throat or neck, major artery (7)
  9. 17. Connected to 8 across, funnily enough (7)
  10. 18. The organ which moves blood around your body (5)
  11. 20. Joint the femur to the tibia (4)
  12. 23. Narrow part of the body below the chest (5)
  13. 26. For hearing with (3)