Muscular System

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