BIOL 404-Exam 4-Muscle 6

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How do Fast and Slow muscle fibers differ compositionally?

Myosins with different maximal rates of ATP use
What filament feature determines the maximal rate of cross bridge cycling and shortening velocity?

The maximal rate that Myosin uses ATP
What are oxidative fibers?

Those that contain numerous mitochondria
What type of fibers contain lots of mitochondria?

Oxidative fibers
Oxidative fibers are dependent on what?
- Blood flow to deliver oxygen and fuel molecules to the muscle
- The amount of Myoglobin
What type of muscle fibers contain few mitochondria and posses a high concentration of enzymes?

Glycolytic fibers
Describe glycolytic fibers:
- Few mitochondria
- Large amounts of glycolytic enzymes
What are the three principal types of muscle fibers?
- Slow-oxidative
- Fast-oxidative-glycolytic
- Fast-glycolytic
What type of muscle fiber is not found in real life?

Slow-glycolytic fibers
Where are slow glycolytic fibers found?

They do not exist
Describe the tension produced by Slow -oxidative fibers:
- Medium tension at a steady rate that can be maintained for some time
Describe the tension produced by Fast-oxidative-glycolytic fibers:
- Higher tension at a steady rate that slowly drops off
Describe the tension produced by Fast-gylcolytic fibers:
- High tension that is not sustained