50.5 skeletal muscle fibers Flashcards

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1
Q

types are classified by:

A

source of ATP or

speed of muscle contractions

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2
Q

types of fibers

A
  • oxidative
  • glycolytic
  • fast twitch
  • slow twitch
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3
Q

oxidative fibers

A
  • get energy from aerobic respiration
  • mitochondria, rich blood supply, myoglobin (oxygen storing protein)

-fatigue slower
(dark meat-migratory birds)

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4
Q

myoglobin

A

oxygen storing protein in oxidative fibers-

  • -binds O2 tighter then hemoglobin even
  • -lets it extract O2 from blood
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5
Q

glycolytic fibers

A

glycolysis for ATP
-larger diameter, less myoglobin than oxidative fibers

-fatigue fast
(white mean-)

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6
Q

fast twitch fibers

A
  • develop tension 2-3 times faster than slow twitch
  • brief, rapid, powerful contractions
  • oxidative or glycolytic fibers
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7
Q

slow twitch fibers

A
  • sustain long contractions
  • -(muscles for posture)
  • oxidative fibers-fatigue slower
  • less Sarcoplasmic R and puts Ca2+ slower–so the ca2+ remains in the cytosol longer
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8
Q

why do slow twitch and fast twitch have different speed of contractions?

A

-rate at which myosin heads hydrolyze (break down) ATP —causing contractions

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