General Muscle Vocab.

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Across
  1. 5. chains of tiny contractile units that make up myofibrils
  2. 6. long ribbon like organelles that push aside nuclei
  3. 10. toughtest 'overcoat' of connective tissue surrounding ENTIRE muscle
  4. 11. (ach)specific neurotransmitter that stimulates skeletal muscle cells
  5. 14. junctions that form with sarcolemma of different muscle cells
  6. 15. larger filaments made mostly of bundled small projection molecules of protein (myosin)- contain ATpase enzymes that link thick and thin filaments together during contraction
  7. 16. chemical released when nerve impulse reaches axonal terminals
  8. 18. bundle of sheathed muscle fibers
  9. 19. plasma membrane
Down
  1. 1. specialized smooth endoplasmic reticulum that surrounds every myofibril
  2. 2. one neuron and all the skeletal muscle cells it stimulates
  3. 3. striated involuntary muscle found only in the heart
  4. 4. cordlike things that attach muscled indirectly to bones, cartilages, or connective tissue coverings of each other
  5. 5. gap between muscle cell membranes filled with intertitial fluid
  6. 7. involuntary muscle with no striations found in walls of hollow visceral organs (stomach, bladder, respiratory)
  7. 8. delicate connective tissue sheath
  8. 9. threadlike protein within sarcomeres
  9. 12. sheetlike things that attach muscles indirectly to bones etc
  10. 13. filaments composed of contractile protein called actin and regulatory proteins that prevent myosin head binding to actin
  11. 17. coarse fibrous membrane that surrounds endomysium