Question

What are the three types of muscle fibers? A) smooth, intermediate- twitch, cardiac B) slow- twitch, intermediate- twitch, fast-twitch C) slow-twitch, fast-twitch, involuntary

Answer 1

Answer:

B) slow- twitch, intermediate- twitch, fast-twitch

Explanation:

The three types of muscle fibers are:

• Slow-twitch: they are also called Red Fibers because of their color or type I. These type of fibers are resistant to fatigue, that means that they can contract for long periods, but its contraction is not very strong. Muscles that maintain our posture, such as our back muscles, have a predominancy of these types of fibers.

• Fast-twitch fibers: they are also called type II, or White Fibers because of their color due to the low supply of blood. They are fibers that contract very fast and are not resistant to fatigue. These types of fibers can generate higher amounts of force in a short period, but their contraction is for a short period. They are present in our eye's muscles.

• Intermediate twitch fibers: they characteristics are between the two types of fibers mentioned above. That is to say, that they do not contract as fast as fast-twitch fibers do but not as slow as slow fibers either, also, they fatigue quickly but nos as quicky as fast-twitch fibers or as slow as slow-twitch. They are in the majority of our muscles.