Muscle Fiber Video

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Muscular System Video:

Muscular System Video Index

Abdominal Muscle Video

Ankle Muscle Video

Arm Muscle Video

Back Muscle Video

Cardiac Muscle Video

Cartilage Video

Elbow Muscle Video

Foot Muscle Video

Hand Muscle Video

Head and Face Muscle Video

Hip Muscle Video

Joint Video

Knee Muscle Video

Leg Muscle Video

Ligament Video

Motor Development Video

Muscle and the Nervous System Video

Muscle Control Video

Muscle Exercise Video

Muscle Fiber Video

Muscle, Tendon, Bone Connection Video

Muscle Type Video

Muscular System Overview Video

Neck Muscle Video

Reflexes Video

Shoulder Muscle Video

Thoracic Muscle Video

Vertebral Muscle Video

Muscular System Index

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Muscles are made of many individual muscle fibers. Muscle fibers are long, cylindrical cells giving skeletal muscles their striped or striated appearance. They are the primary component responsible for muscle contraction. There are two basic types of muscle fibers. Slow-twitch fibers, also called ST or Type I fibers, have a slow contraction time, but a high resistance to fatigue. Slow-twitch muscles are used for aerobic muscle activities requiring a low-level, sustained force, such as sitting or walking. Fast-twitch fibers, also called FT or Type II fibers, have a quick contraction time, but are quick to fatigue. Fast-twitch muscles are used for short anaerobic activities requiring a high-force, such as sprinting or jumping. Interested in learning more about muscle fiber? Check out the following muscle fiber videos. For additional information, also see our muscle fiber reference materials.

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