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.
<h3>
What is the difference between slow-twitch and fast-twitch motor units?</h3>
There are two muscle fiber types in the skeletal muscle, and their function is not the same. These are
<u>Slow-twitch muscle fibers</u> - 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.
<u>Fast-twitch muscle fibers</u> - Type II-
- 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
brainly.com/question/16951957
brainly.com/question/12275017
brainly.com/question/1232212
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