Muscle crossword puzzle

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Across
  1. 2. Enzymes that break down ACH
  2. 5. muscle produces heat and protects organs
  3. 7. Plasma membrane of muscle cells
  4. 9. Pacemakers cells of the heart
  5. 12. Enlargement for muscle
  6. 13. Cells contain a lot of mitochondria
  7. 14. Membrane that surronds Fascicles
  8. 16. Fiber that contains actin and myosin
  9. 17. A muscle under conscious control
  10. 18. A sustained involuntary contraction
  11. 19. Heart muscle
  12. 20. Gap between neuron and motor end plate
Down
  1. 1. Boundary between sarcomeres
  2. 3. A single muscle cell
  3. 4. A muscle that is not under conscious control
  4. 6. Membrane that surrounds muscle fibers
  5. 8. Muscle becomes small & weak due to disuse
  6. 10. Smaller muscle fibers
  7. 11. joined together by intercalated discs
  8. 15. Bundle of fibers