Muscular System

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Across
  1. 2. cytoplasm of a muscle cell
  2. 3. an area where a motor nerve makes contact with a muscle fiber
  3. 4. a protein that holds tropomyosin in place
  4. 5. this disappears when a sarcomere contracts
  5. 7. central part of a muscle
  6. 8. plasma membrane of a muscle cell
  7. 10. a bundle of muscle fibers
  8. 13. connective tissue covering of a muscle fiber
  9. 15. contractile unit of the muscle fiber
  10. 17. protein fiber that makes up the thin filaments
  11. 19. major organelle of a skeletal muscle fiber
  12. 20. another name for a light band of striations
  13. 21. connective tissue surrounding a muscle fascicle
Down
  1. 1. a skeletal muscle cell
  2. 2. organelle that stores calcium ions in a muscle cell
  3. 6. protein that covers the active sites on actin
  4. 9. protein fiber that makes up the thick filaments
  5. 11. central part of a triad that transfers an action potential from the plasma membrane
  6. 12. the structure that separates two successive sarcomeres
  7. 14. muscle attachment on a bone that moves when the muscle contracts
  8. 16. connective tissue covering of a muscle
  9. 17. another name for a dark band of striations
  10. 18. muscle attachment on a bone that does not move when the muscle contracts