lab practical 2 NTK List 9

  1. a band
    The component of the sarcomere that appears darker because it contains thick filaments and areas in which the thick and thin filaments overlap.
  2. Actin
    A bead-shaped contractile protein found in muscle fibers and motile cells
  3. Elastic Filamet
    A myofilament that consists of the structural protein titin.
  4. Endomysium
    meaning within the muscle, is a wispy layer of areolar connective tissue that ensheaths each individual myocyte
  5. Epimysium
    a sheath of fibrous elastic tissue surrounding a muscle.
  6. i band
    The component of the sarcomere that appears lighter because it contains only thin filaments.
  7. h zone
    the zone of the thick filaments that is not superimposed by the thin filaments.
  8. m line
    the attachment site for the thick filaments
  9. Motor End Plate
    The specialized region of the skeletal muscle fiber plasma membrane that contains receptors for acetylcholine.
  10. Muscle Fiber
    An alternate name for a skeletal muscle cell.
  11. Myofibril
    Long, cylindrical organelles composed of muscle proteins in a muscle fiber.
  12. myosin
    A club-shaped contractile protein found in muscle fibers and motile cells
  13. neuromuscular junction
    The location where a neuron communicates with a muscle fiber.
  14. Sarcolemma
    The plasma membrane of a muscle fiber.
  15. Sarcomere
    The functional unit of muscle contraction; consists of the area of the myofibril from one Z-disc to the next Z-disc.
  16. Sarcoplasmic Reticulum
    The specialized smooth endoplasmic reticulum of a muscle fiber that stores calcium ions.
  17. terminal Cisternae
    Enlarged regions of the sarcoplasmic reticulum where it contacts T-tubules.
  18. thick filament
    A myofilament composed of many molecules of the protein myosin.
  19. thin filament
    A myofilament composed of molecules of the proteins actin, troponin, and tropomyosin.
  20. triad
    the structure formed by a T tubule with a sarcoplasmic reticulum (SR) known as the terminal cisterna on either side.
  21. tropomyosin
    a protein involved in muscle contraction. It is related to myosin and occurs together with troponin in the thin filaments of muscle tissue.
  22. troponin
    a complex of muscle proteins which, when combined with Ca++, influence tropomyosin to initiate contraction.
Card Set
lab practical 2 NTK List 9
AP Lab Pracical