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Depends on oxygen delivery and aerobic mechanisms. Have very fast-acting myosin ATPases and depend upon anaerobic metabolism during contraction. Red fibers, the smallest of the fiber types. Contain abundant amounts of glycogen. Abundant in muscles used to maintain posture. A relatively high percentage are found in successful marathon runners. A. Slow (oxidative), fatigue-resistant fibers B. Fast (oxidative or glycolytic), fatigable fibers

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Answer:

Fast glycolytic fibers use anaerobic metabolism to produce energy which is used by the muscle for high tension contraction but these muscles fatigue quickly.

  • It has amount amount of glycogen and have very quick acting myosin ATPase.

Slow oxidative are known as resistant fibers which generates energy(ATP) by the help of aerobic system.

  • It depends on the delivery of oxygen and have red fibers which is smallest of all the fibers.
  • It is found in marathon runners and its main function is to maintain posture.

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