ANim phys ch10 muscles and animal movement

  1. muscle arise from embryonic muscle cells called
  2. functional unit of striated muscle
  3. each sarcomere is bounded at either end by a
    Z disk
  4. contains only thick filaments and only myosin
  5. middle of H zone is
    m line. contains enzymes that are important in the energ metabolism of muscle fibers
  6. portiion between 2 A bands and only thin filaments is and actin only
    I bands
  7. muscle contracts when
    the cross-bridges on myosin molecules bind transiently to sites on actin molecules, causes myosin to change conformation
  8. when myosin comlexes are treated with proteolutic enzme trypsin
    separate into light meromyosin and heavy meromyosin
  9. isometric contraction
    length of muscle doesnt change
  10. isotonic contraction
    muscle is allowed to shorten
  11. filamentous protein that runs parallel to actin filaments
  12. around the perimeter of each myofibril at the level of the z disk is a hollow membranous tube called
    traverse tubule T-Tubule. less 0.1 micrometer in diameter
  13. four major groups of vertebrate skeletal muscle
    tonic fibers and 3 types of twitch fibers(phasic)
  14. tonic muscle fibers
    contract slowly, no twitches, postural muscle no atp
  15. slow twitch or type I
    contract slowly fatigue slowly. contain large number of mitochondrai and have rich blood supply. dark meat
  16. fast twitch oxidative type IIa
    high v max, activate quickly, flight muscles,relativley resistant to fatigue
  17. fst-twitch glycolytic type IIb
    high v-max activate and relax quickly, few mitchondria rely on anaerobic glycolysis for atp, white breast
  18. causes a joint to close
  19. causes joint to open
  20. collection of motor neurons that innervate a particular muscle is
    motor pool
  21. represents one alpha motor neuron and all the muscle cells it contacts synaptically
    motor unit
  22. heart contraction is
    myogenic, initiated in te muscle fibers themselves
  23. dihydropyridine
  24. class of msucles that lack sarcomeres and do not appear striaed when viewed with a micro
    smooth muscles
  25. binds to thin filaments in smooth muscle, prevents binding between myosin and actin.calcium binding regulatory protein role in latch mechanism smooth muscle
  26. troponin-c structurally like, calcium-binding protein regulatory protein found in all tissues
  27. red muscles contain
    myoglobin and are power muscles, slow
  28. white muscles
    less myoglobin fast but fatigue easy
  29. striations are created by
    myosin and actin overlap
  30. fascicles
    groups of muscle cells, surrounded by perimysium
Card Set
ANim phys ch10 muscles and animal movement