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Biology
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Name and Discuss Muscle Fiber Types.

Jun 29th, 2015

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Types of muscle fibers 

Type I

These types of muscle fibers are also known as twitch fibers. They are usually red in color because of the presence of large volumes of myoglobin and thus high levels of mitochondria and oxygen. They are thus capable of producing low levels of contractions and are resistance to fatigue. They utilize aerobic metabolic cycle.

Type IIa

They are also known as the fast oxidative fibers and are usually hybrid of both of type I and II fibers. They usually contain large numbers of myoglobin and mitochondria, thus they are red in color. They produce fast and strong muscle contraction because they manufacture and split ATP at fast rate.

Type IIb

Also known as fast glycolytic fibers, and are white in color because they produce low levels of mitochondria and myoglobin.  They produce ATP at a very slow rate by anaerobic metabolism, and also break it down very fast. Because of this, they can rapidly cause fatigue.


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Jun 29th, 2015

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