muscle system by Kylie gastreich

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Across
  1. 3. specialized grouping of cells in our hearts, pacemaker of the heart
  2. 5. the minimal amount of stimulus required to cause a contraction
  3. 7. the neurotransmitter that crosses the synaptic gap and causes muscle contraction
  4. 8. another name for synapse
  5. 10. gap between the neuron and motor end plate
  6. 13. the plasma membrane of muscle cells
  7. 15. a membrane that surrounds muscle cell/fibers
  8. 16. light, thin
  9. 18. where neurotransmitters are stored
  10. 20. a muscle that is not under conscious control
  11. 21. a single muscle cell
  12. 23. more and more fibers contract as the intensity of the stimulus increases
  13. 24. where a nerve and muscle fiber/cell come together
  14. 25. where thick and thin filaments overlap
Down
  1. 1. surrounds fascicles
  2. 2. individual heart muscle cells
  3. 4. fibers do not partially contract, they either do or don't
  4. 6. bundles organized inside skeletal muscle
  5. 9. enzyme that breaks down ACH
  6. 11. muscle found in the walls of hollow organs
  7. 12. the boundary between sarcomeres (where they connect)
  8. 14. only group of voluntary muscles
  9. 17. each muscle is surrounded by a membrane called _____
  10. 19. the functional unit inside of a muscle fiber
  11. 22. thick, dark