Muscle crossword

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Across
  1. 5. minimal level of stimulus to cause a contraction
  2. 7. membranous channels that surround the myofibrils; sarcoplasmic
  3. 10. section of a myofibril from one Z line to the next Z line
  4. 11. when muscles become tired
  5. 13. individual muscle fiber
  6. 15. overlapping patterns of actin and myosin; I and A
  7. 17. Outermost layer, surrounds entire muscle
  8. 19. organelle that provides the energy needed for muscle contraction
  9. 20. thin filaments of a muscle fiber
  10. 21. adenosine helps regenerate ATP
  11. 22. describes muscles that are striped in appearance
  12. 24. connects bones to other bones
  13. 25. thick filaments of a muscle fiber
Down
  1. 1. neurotransmitter used to cause muscle contraction
  2. 2. surrounds fascicles
  3. 3. this superhero has huge muscles when he's angry; David Banner
  4. 4. type of muscle that makes up the heart
  5. 6. type of muscle that connects to bones, voluntary
  6. 8. store neurotransmitters
  7. 9. muscle fiber membrane
  8. 12. theory that explains how muscle contraction works
  9. 14. bundle of muscle fibers
  10. 16. type of muscle found in the digestive tract, involuntary
  11. 18. cleft space between a neuron and the muscle
  12. 23. connects muscles to bones