Muscle Tissue

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Across
  1. 2. Cisterna Enlarged portions of sarcoplasmic reticulum
  2. 7. Long, cylindrical organelles with in muscle fibers; comprised of thousands of repeating subunits called sarcomeres
  3. 8. Sheath of a CT surrounding a bundle of muscle fibers; middle layer
  4. 9. Muscle cell cytoplasm
  5. 11. Inside each fascicle, each muscle fiber is encased in a thin CT layer of collagen & reticular fibers
  6. 17. A sheet of pearly white fibrous tissue that takes the piece of a tendon in flat muscles having a wide area of attachment
  7. 18. Sheath of dense, irregular CT wrapping each muscle
  8. 19. Potential Nerve impulse from the CNS (CNS = brain + spinal cord)
  9. 20. Functional contractile unit of the muscle fiber; comprised of myofilaments
  10. 21. End Plate Area of the muscle cell sarcolemma; location of neurotransmitter receptors
  11. 23. regulatory protein that binds to calcium ions, actin & tropomyosin
Down
  1. 1. Tubules Invaginations of the sarcolemma into the sarcoplasm that run b/t two enlarged portions of sarcoplasmic reticulum called terminal cisternae
  2. 3. reticulum Specialized smooth endoplasmic reticulum; stores, releases and retrieves calcium ions (Ca++)
  3. 4. Fiber A skeletal muscle cell
  4. 5. thick filament; b/c it is comprised of many myosin molecules; contractile protein comprised of a head (which is free to pivot), a neck and a tail
  5. 6. two contractile proteins which give the muscle its striated appearance
  6. 10. attachment of myosin with actin
  7. 12. A cell capable of generating an action potential (nerve impulse)
  8. 13. Cell (plasma) membrane
  9. 14. Inside each skeletal muscle. Muscle fibers are organized into individual bundles
  10. 15. Connects muscle to bone
  11. 16. regulatory protein that covers the active sites of the actin in a resting muscle. This prevents the actin & myosin fibers from binding
  12. 17. thin filament; contractile protein molecule that possesses an active site where one myosin molecule can bind
  13. 22. neuron A neuron through which an action potential from the CNS travels to stimulate a response such as muscle contractions
  14. 23. Two terminal cisternae and one transverse tubule