BIOL 223L Lab 5 - Muscle Cell Structure

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christophertkennedy
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110313
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BIOL 223L Lab 5 - Muscle Cell Structure
Updated:
2011-10-19 17:37:37
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anatomy physiology muscle cell
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Study Cards for Lab 5 BIOL 223L CSN
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  1. Communication between the nervous system and a skeletal muscle fiber occurs at a specialized intercellular connection known as the:
    neuromuscular juntion
  2. The plasma membrane of a muscle fiber (cell) is called the:
    sarcolemma
  3. The plasma membrane of a muscle fiber surrounds the _______, or cytoplasm of the muscle fiber.
    sarcoplasm
  4. Each myoblast contributes one _______ to the mature muscle cell.
    nuclei
  5. The cylindrical structures inside of a muscle cell that allow it to contract are called:
    myofibrils
  6. Surrounding each myofibril is a tubular membrane network known as:
    sarcoplasmic reticulum
  7. Narrow tubes that are continuous with the plasma membrane that for the rapid distribution of signals deep into the muscle fiber are called:
    transverse tubules
  8. The combination of terminal cisternae and a transverse tubule is known as a:
    triad
  9. Squeezed between the myofibrils and the sarcolemma you will find these organelles which produce ATP.
    mitochondrion
  10. Myofibrils consist of bundles of protein filaments called:
    myofilaments
  11. Myofilaments are characterized as being either:
    thin or thick
  12. The repeating functional units of a myofibril are known as:
    sarcomeres
  13. Thin myofilaments are comprised primarily of:
    actin
  14. Thick myofilaments are comprised primarily of:
    myosin
  15. The boundary between adjacent sarcomeres is known as the:
    Z line
  16. Which "line" connects the central portion of each thick filaments to neighboring filaments?
    the M line
  17. Which band, or zone, contains thick filaments but no thin filaments?
    the H zone
  18. Which band, or zone surrounds the M line?
    the H zone
  19. Which band, or zone contains thin filaments but no thick filaments?
    the I band
  20. Which band, or zone, will appear "lighter" in color upon examination?
    the I band
  21. Which band contains the thick filaments?
    the A band
  22. Which band will appear "darker" in color upon examination?
    the A band
  23. The zone where thin filaments are located between thick filaments is known as the:
    zone of overlap
  24. The A band will contain what three "sub-zones?"
    • the M line
    • the H zone
    • the zone of overlap
  25. The Z line is roughly in the center of which "band?"
    the I band
  26. The M line is roughly in the center of which "band?"
    the A band
  27. The H band is found in the middle of which "band?"
    the A band
  28. Expanded chambers of the SR where fusion with the T tubules occurs are known as:
    terminal cisternae
  29. Actin makes up which type of myofilament?
    thin myofilament
  30. Myosin makes up which type of myofilament?
    thick myofilament

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