crossword puzzle

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Across
  1. 2. is a tissue that is made of liquids
  2. 5. arm straighten relaxes
  3. 7. bladder release chemicals into the small intestine
  4. 9. stretched or torn
  5. 12. involuntary
  6. 13. electrical signals
Down
  1. 1. internal organs
  2. 3. sponge like organs
  3. 4. voluntary
  4. 6. a four chambered organ
  5. 8. breaks down food
  6. 10. arm bends contracts
  7. 11. skull