Bio 142 Muscles Exam

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  1. What are the functions of skeletal muscles
    • Produce Skeletal Movement
    • Maintain Posture
    • Support Soft tissue
    • Guard entrances and exits
    • Maintain body temperature
    • Provide Nutrient Reserves
  2. Attaches muscles to bone.
  3. The collagenous fibers that line and bind fascicles
  4. Collagenous fiber lining that encapsulates an entire muscle, and is connected to the deep faciae
  5. The connective tissue that surrounds and protects each  individual muscle fiber within the fascicle.
  6. a broad sheet of connective tissue that muscles bind to. may connect to multiple bones.
  7. Muscle cells are also considered
    muscle fiber
  8. cylindrical structures that fill the sarcoplasm of each muscle cell.
  9. functional units of myofilaments that contract
  10. Thin Filaments
  11. Thin Filaments
  12. Point where the motor neuron interacts with muscle fibers by releases acetylcholine vesicles into the synaptic cleft.
    Neuromuscular junction
  13. What happens at neuromuscular junction.
    • Electrical impulse travels from the neuron to the muscle cell triggering the release of calcium ions.
    • Calcium ions trigger the release of acetylcholine which bind to receptor sites.
    • acetylcholine cause the release of sodium ions causing contraction
  14. Zone of muscle cell with no thick filaments
    I Band
  15. Serves as the boundary between two thin filaments
    Z band
  16. zone in a resting cell that contains thick filaments but no thin filaments
    H Band
  17. Joins each of the thick filaments by their midpoint
    M Band
  18. Dense region of the sarcomere that contains the thick filaments
    A Band
  19. how do muscles move
    When actin is exposed to calcium ions, the troponin is moved away exposing the active site for the myosin heads to bond to
  20. When the active site on the actin is open, the myosin head becomes attracted to it, and it binds dropping the ADP. The myosin recocks when another ATP molecule binds, and it recocks allowing it to powerstroke again to the next active site
    Power stroke
  21. a graph of tension development in muscle fibers
  22. All the muscle fibers controlled by a single motor neuron
    motor unit
  23. resting tension in a skeletal muscle
    muscle tone
  24. tension rises exceeding the load, and the muscle length changes
    Isotonic contraction
  25. Muscle contracts not exceeding the load, muscle does not change in length
    isometric contraction
  26. Load - fulcrum - force
    first class lever
  27. Fulcrum - Load - Force
    Second class lever
  28. Fulcrum - Force - Load
    Third Class Fulcrum
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Bio 142 Muscles Exam
Bio 142 muscles exam
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