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Describe how calcium ions released from SR of muscle cellstrigger contraction of myofibrils. Use the following words:troponin, tropomyosin, Z-disc, sarcomere.

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Tod Thiel
Tod ThielLv2
30 Sep 2019
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Related questions

there are 4 stages in muscle contraction: excitation, excitation-contraction coupling, contraction, and relaxation.
a) briefly describe the molecular process of excitation, beginning at the synaptic bulb of the neuron. how does this affect the muscle fiber?
b) how is calcium released from the sarcoplasmic reticulum during excitation-contraction coupling, and how do troponin and tropomyosin regulate the interaction between myosin and actin
c) describe the events of one cross-bridge cycle and how this shortens the sarcomere.
d) following contraction, what events must occur to allow the muscle to relax?

Describe the role that each of the following has in the contraction of a muscle fiber according to the sliding filament theory.

a. The power stroke:

b. Calcium ions:

c. Troponin-tropomyosin complex:

broken down answers to help study

  1. know which joint has no joint cavity
  2. know the term for freely movablejoint
  3. know the difference between syndesmoses,gomphosis, and suture and example for each.
  4. know Synarthroses, Amphiarthroses andDiarthroses
  5. know synchondrosis and examples forit
  6. know different parts and components ofsynovial joints
  7. know different types of movements likegliding, flexion, extension, circumduction and rotation.
  8. know the structural category of synovialjoints and know examples for them
  9. Know the different joint movements
  10. know the functions of muscle
  11. know isometric vs isotonic movment. Knowconcentric vs eccentric contraction
  12. know different layers of connective tissuesurrounding a skeletal muscle
  13. know the definition of fascicle,aponoresis, muscle fiber, myofibrils and myofilaments.
  14. know how an action potential releases Cafrom SR
  15. know different regions of a sarcomere,including A and I band, Z disc, H zone, M line etc
  16. know the structures of thick and thinfilaments
  17. know the sliding theory of musclecontraction
  18. know the effect of Ach esterase
  19. know the source of energy in skeletalmuscle, including glycolysis and its result
  20. know the definition of a muscle twitch,unfused and fused tetanus
  21. know different types of muscle fibers,slow oxidative, fast glycolytic and slow glycolytic fibers andtheir characteristics
  22. know the difference between spasm andcramp
  23. know oxygen debt, the reason and theresult
  24. know different part of a curve for muscletwitch
  25. know the process of smooth musclecontraction
  26. know the role of caldesmon and calponin inmuscle contraction
  27. know the counterpart of skeletal musclecomponents in the smooth muscle

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