Muscular System

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Across
  1. 2. surrounds each individual muscle fiber
  2. 4. inner material surround fibers
  3. 7. thin, light filaments
  4. 9. individual parallel muscle fibers within sarcoplasm
  5. 10. muscles become small and weak
  6. 11. where a nerve and muscle fiber come together
  7. 13. theory of how muscle contracts
  8. 14. fibers that are arranged in bundles
  9. 17. outermost layer of muscle
  10. 18. where neurotransmitters are stored
  11. 19. causes a person's muscles to contract and not relax
  12. 20. separates and surrounds fascicles
  13. 21. muscles enlarge
Down
  1. 1. a type of neurotransmitter involved in muscle contraction
  2. 3. joints become stiffen after death
  3. 5. first step in a muscle contraction
  4. 6. a sustained involuntary contraction
  5. 8. muscle fiber membrane
  6. 12. thick, dark filaments
  7. 15. gap between the neuron and motor end plate (synaptic cleft)
  8. 16. muscle loses ability to contract after prolonged use