Another Cells and Body Systems Puzzle

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Across
  1. 7. Cell organelle where DNA is located
  2. 8. Hair and nails are part of this organ system
  3. 9. Organelles that provide the energy for a cell
  4. 11. All the chemical reactions occurring in a cell
  5. 12. Feedback loop that reverses a controlled condition
Down
  1. 1. Discovered that all plants are made of cells
  2. 2. A tissue is made of many similar ______
  3. 3. Cell, tissue, organ, organ system, ______
  4. 4. Organ system that provides structure and support
  5. 5. Feedback loop that strengthens a controlled condition
  6. 6. Also known as the human immune system
  7. 10. The cell ______ surrounds all cell types