Muscular System Review

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Across
  1. 8. in sides of neck, turns head
  2. 10. thin filament that makes up a myofibril
  3. 13. muscle in face that helps chew
  4. 14. in neck and lower jaw that controls lower facial expressions and opens mouth
  5. 16. a ___ neuron stimulates skeletal muscles to contract
  6. 19. border of a sarcomere, where the actin anchors
  7. 20. in shoulder
  8. 21. fiber single muscle cell
  9. 22. connective tissue surrounding entire skeletal muscle
  10. 27. the ____ major adducts humerus
  11. 28. the ___ anterior is involved in dorsiflexion of foot (up)
  12. 30. smallest contractile unit
  13. 31. in back of thigh
  14. 35. the axon ___ contains vesicles which will release a signal into the synapse
  15. 37. rodlike bundle of myofilaments
  16. 38. triggers the release of calcium, which starts muscle contraction
  17. 39. specialized endoplasmic reticulum that stores calcium
Down
  1. 1. cell membrane of a muscle fiber
  2. 2. thick filament with heads that bind to actin
  3. 3. a ___ muscle is striated, involuntary, and found in the heart
  4. 4. a ___ muscle is non striated, spindle shaped, has one nucleus, and is involuntary
  5. 5. the ___ cleft is a junction where the signal is released
  6. 6. connects muscle to bone
  7. 7. the ___ dorsi is in lower back
  8. 9. ___ rotation is away from the midline
  9. 11. the ___ anterior is on side of ribs and protracts scapula
  10. 12. bundle of muscle fibers
  11. 15. surrounds a single muscle cell/fiber
  12. 17. ___ rotation is towards the midline
  13. 18. bridge forms after myosin heads attach to actin
  14. 23. surrounds a bundle of muscle fibers
  15. 24. causes myosin heads to unbind from actin and be in energized state
  16. 25. layer of fibrous tissue separating muscles from each other and skin
  17. 26. involved in plantar flexion of foot (downwards), is located on posterior calf
  18. 29. signals the troponin to unblock actin's binding sites
  19. 32. transmits the nerve's electrical signal
  20. 33. a ___ muscle is striated, multinucleate, and has long cylindrical cells that are voluntary
  21. 34. the ___ potential is an electrical current created by movement of sodium and potassium ions across the sarcolemma
  22. 36. rotates and twists trunk, on side of abs