This lesson will focus on the types of skeletal muscles and the differences between them by covering:
Red skeletal muscles are also known as slow skeletal muscles. They are the type of skeletal muscles that can contract slowly for long periods of time. These are muscles that you use on a regular basis, and include those that help you to maintain your posture.
These muscles have fibers with more myoglobin and capillaries in them to allow for the sustained activity they require. Myoglobin is a protein that binds to oxygen and is found in the fibers of red muscle cells. This protein is also red in color, and is what gives this type of muscle its red appearance. Red skeletal muscles also have more capillaries. This allows more blood to run to the muscles, delivering oxygen and taking away carbon dioxide as the muscles work.
White skeletal muscles, or fast skeletal muscles, can contract quickly for short periods of time.
The muscles in your hand can contract quickly, but they can't sustain activity for a very long period of time. If you are writing, you can only write so long before your hand really starts to cramp up.
This type of muscle lacks the amount of myoglobin that red skeletal muscles contain, so they are white in appearance. They also have fewer capillaries running to them, meaning less blood is supplied to them as well. This is why they can only contract for short periods of time. White skeletal muscles also have fewer mitochondria in them; mitochondria provides muscles with ATP and energy to sustain contractions.
There are two types of skeletal muscles. Red skeletal muscles, also known as slow skeletal muscles, are muscles that contract slowly over a long period of time. They contain more myoglobin and capillaries carrying blood to sustain long periods of work. The myoglobin is red, and gives slow skeletal muscles their color. White skeletal muscles are also called fast skeletal muscles. While they can contract quickly, they cannot sustain activity for a long time. They do not have as much myoglobin, blood flow, or mitochondria as red skeletal muscles do to allow for extended use.
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Source: Source: THIS WORK IS ADAPTED FROM SOPHIA AUTHOR AMANDA SODERLIND
Also known as white skeletal muscle; a type of muscle that can contract quickly for a short period of time.
A protein that binds oxygen which is necessary for the production of ATP.
Also known as red skeletal muscle; a type of muscle that can contract slowly for long periods of time.