Organ System Crossword

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Across
  1. 1. Maintains posture
  2. 4. Keeps blood supplied with oxygen
  3. 7. Breaks down food
  4. 9. Secretes regulatory hormones
  5. 10. Returns fluids to blood vessels
  6. 11. Transports materials throughout the body
Down
  1. 2. Site of blood cell formation
  2. 3. Activates muscles and glands
  3. 5. Forms the external body covering
  4. 6. Production of offspring
  5. 8. Eliminates nitrogenous wastes