2.10

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Author:
efrain12
ID:
241081
Filename:
2.10
Updated:
2013-10-16 20:31:20
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Description:
muscular architecture
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  1. what do the cells of excitable tissues contain?
    plasma membrane that can alter electrical potential from the normal resting
  2. (muscle types) which is the longest cell type?
    skeletal muscle
  3. (muscle types) is the skeletal muscles under voluntary or involuntary control?
    voluntary
  4. how does a muscle acquire a straited look?
    it has overlapping proten that give it a banded appearance
  5. (muscle types)is smooth muscle striated?
    no
  6. (muscle types) description of smooth muscle cells (2)
    -smaller

    -spindle shape
  7. (muscle types) what appears between the fibers of cardiac muscle?
    • intercalated disks
    • *gap junctions
  8. (muscle types) cardiac muscle- what is significant about the way the fibers are placed?
    they are striated but the fibers are branching
  9. muscle characterisitcis) Excitability
    can conduct an action potential in response to a stimulus
  10. muscle characterisitcis) contractility
    • can shorten and lengthen
    • *generates force
    • *differs based on their location and function
  11. muscle characterisitcis) extensibility
    can be stretched beyond resting length when relaxed
  12. muscle characterisitcis) elasticity
    resumes original length
  13. muscles functions) 4 functions of muscles
    • -produce movement
    • *all 3 muscle types do this

    • -maintain posture
    • *skeltal muscles

    -stabilize joints

    -generate heat
  14. microscopic anatomy) What is a muscle cell?
    • elongated cell known as a fiber
    • *runs the length of a muscle
  15. microscopic anatomy) what else besides the endomysium suround a muscle cell?
    • sarcolemma
    • *plasma membrane
  16. microscopic anatomy) what does the sarcolemma contain? (2)
    sarcoplasm (cytoplasm) and organelles
  17. microscopic anatomy) what 6 things does a muscle cell contain?
    -nuclei

    -mitochondria

    -myoglobin

    -glycosomes

    -sarcoplasmic reticulum

    -myofibrils
  18. microscopic anatomy)(muscle cell's oraganelles and proteins) nuclei (2)
    -they have multiple

    -located on the peripheral
  19. microscopic anatomy)(muscle cell's oraganelles and proteins) mitochondria
    • they have numerous of mitochondria
    • *they supply the enrgy
  20. microscopic anatomy)(muscle cell's oraganelles and proteins) myoglobin
    protein that stores oxygen
  21. microscopic anatomy)(muscle cell's oraganelles and proteins)glycosomes
    glycogen storage granules
  22. microscopic anatomy)(muscle cell's oraganelles and proteins) sarcoplasmic reticulum
    • modified endoplasmic reticulum
    • *they surround the myofibrils
  23. microscopic anatomy)(muscle cell's oraganelles and proteins) myofibrils
    • -contractile organelle
    • *make up 80% of the skeletal muscle cell
  24. (within myofibril) 2 types of myofilaments
    thick and thin
  25. what are myofilaments
    rods within a muscle cell
  26. (within myofibril) what is a thick filament made up off?
    multiple myosin molecules are bvundled together to create this filament
  27. (within myofibril) what protein makes up the thick filament?
    myosin
  28. (within myofibril) description of myosin
    long rope like tail and 2 heads
  29. (within myofibril) what 3 proteins make up the thin filaments? (3)
    -actin

    -tropomyosin

    -troponin
  30. banding pattern) what is the A-band?
    is teh length of the thick filament
  31. banding pattern) what is the I-band? (2)
    -area that only contains thin filament

    -there is no overlapping of thick and thin at this point
  32. banding pattern) What is H-zone?
    no thin filament here
  33. banding pattern) what is M-line? (2)
    -M line bisects the H zone

    -this is where we have end to end attachment of filaments
  34. banding pattern) Z-line? (2)
    -bisects the I band

    -end to end attachment of thin filaments
  35. what contributes to the banding pattern?
    the specific overlap of thick and thin filaments
  36. banding pattern) where is the sarcomere?
    area between the 2 Z lines
  37. (elastic filaments) do these participate in contraction?
    no
  38. (elastic filament)  function
    supportive and structural proteins that provide integrity to sarcomere and myofibril
  39. (elastic filament) titin- where is it located?
    between z-line and thick filament
  40. (elastic filament) two types?
    -titin

    -nebulin
  41. (elastic filament) location of nebulin
    runs along thin filament
  42. (elastic filament) nebulin- function?
    provides integrity to thin filament
  43. (elastic filament)what wraps around the nebulin?
    thin filament
  44. (elastic filament) titin- what ability does it provide the skeletal muscle with?
    recoil ability
  45. (intracellular tubules) what is a triad?
    -t tubule + 2 terminal cisternae
  46. (intracellular tubules)  what are the 2?
    -sarcoplasmic reticulum

    -t-tubules
  47. (intracellular tubules) what is terminal cisternae?
    part of the sarcoplasmic that doesnt branch out into networks
  48. (intracellular tubules) T-tubules- where do they extend from?
    from plasma membrane and wrap around each of myofibril

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