Muscle Anatomy Crossword

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Across
  1. 3. channels that surround the myofibrils; sarcoplasmic _______
  2. 7. neurotransmitter used to cause a muscle contraction
  3. 9. inprovide muscle fiber
  4. 11. connects bones to other bones
  5. 13. this superhero has huge muscles when he's angry; David Banner
  6. 14. thick filaments of a muscle fiber
  7. 15. surrounds fascicles
  8. 18. helps reginerate ATP; ______ phosphate
Down
  1. 1. bundle of muscle fibers
  2. 2. muscle fiber membrane
  3. 4. type of muscle that makes up the heart
  4. 5. when muscles become tired
  5. 6. they store neurotransmitters
  6. 8. outermost layer; surrounds the entire muscle
  7. 9. organelle that provides the energy needed for muscle contraction
  8. 10. explains how muscle contractions work; sliding ______ theory
  9. 12. thin filaments of a muscle fiber
  10. 16. connects muscles to bones
  11. 17. space between a neuron and the muscle; synaptic _____