Question

The primary mechanical difference between slow-twitch versus fast-twitch motor units in normal movement are: a. the amount of connective tissue b. differences in passive tension c. the timing of tension rise and fall d. their location in the muscle e. differences in peak tension

Answer 1

Slow-twitch fibers resist fatigue and keep contracted for long periods. Fast-twitch fibers provide force and fast contraction for short periods. Option C. timing of tension rise and fall.

What is the difference between slow-twitch and fast-twitch motor units?

 

There are two muscle fiber types in the skeletal muscle, and their function is not the same. These are

• the fast-twitch

• the slow-twitch

Slow-twitch muscle fibers - Type I-

• These are small-sized fibers.

• They provide low force and slow contraction.

• These are fibers that resist fatigue and are in charge of sustained movements.

• They get to their maximum tension slower.

• Since their action is sustained for long periods, they need too much energy to keep working. This is why these cells have several mitochondria.

• They can support long periods of contraction.

Fast-twitch muscle fibers - Type II-

• These are large cells.

• They provide high force and fast contraction.

• They get to their maximum tension faster.

• These fibers offer a more powerful force than the slow-twitch ones.

• However, their duration is lower, and get to fatigue much faster. They offer short-period contractions.

• They support powerful and fast movements, but for short periods.

According to this information, we can assume that the main difference between slow-twitch and fast-twitch motor units is the timing of tension rise and fall. Option C.

You can learn more about slow-twitch and fast-twitch motor units at

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