Case 2b - Body Composition - Three types of muscle fiber

7 important questions on Case 2b - Body Composition - Three types of muscle fiber

What influences the clour of the fibres?

The colour has to do with the presence of myoglobin in the fibre, which in turn has to do with the method the fibre uses to produce energy.

How does the red muscle fibre produce energy?

Red fibre contains alot of mitochondria that are needed for energy supply. The energy production is slow, but efficient.

What is the function of red muscle fibre?

Red fibres are suited for sustained tension, such as necessary for muscles with a function in body posture.
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What is the function of white muscle fiber?

White fibre is suited for rapid reaction and movement as they produce energy faster bute less sufficient.

How does white muscle fibre produce energy?

White msucle fibre does not have any myoglobin or mitochondria and are surrounded by less capillaries. So they get their energy from glycogen store in the fibers.

What are the consequences in white fibre to using glycogen as energy source?

The use of white fibre tissue only work for a limited amount of time, because the supply of new fuel via the blood is too slow. Once the supply is exhausted so is the muscle.

What is intermediate muscle fiber?

Intermediate muscle fiberhas qualities of red and white fibre.

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