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

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06-05-2022
Biology

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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

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marianaegarciaperedo marianaegarciaperedo · Answer 1 · 2022-05-09T12:19:13+02:00

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.

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