digestive, respiratory, muscular, and skeletal system

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Across
  1. 2. contains acid to break down food.
  2. 3. act like balloons inside your body and helps you breathe.
  3. 7. biggest part of the brain.
Down
  1. 1. where the beginning of your digestion starts.
  2. 2. the bones inside your body.
  3. 4. the bone that protects your brain.
  4. 5. located next to the esophagus.
  5. 6. the bottom half of your leg.