Fast-twitch muscle fibers are characterized by which of the following? A) Tonic function B) Slow excitability C) Low number of muscle spindles D) High fatigability
Understand the Problem
The question is asking to identify the characteristic features of fast-twitch muscle fibers from the given options. Fast-twitch muscle fibers are known to have specific physiological properties that distinguish them from slow-twitch fibers.
Answer
High fatigability
Fast-twitch muscle fibers are characterized by high fatigability.
Answer for screen readers
Fast-twitch muscle fibers are characterized by high fatigability.
More Information
Fast-twitch muscle fibers are designed for short bursts of power and speed, making them quick to tire. They are also known as type 2 fibers.
Tips
A common mistake is confusing the characteristics of fast-twitch with those of slow-twitch fibers, which have high endurance but lower power output.
Sources
- Muscle Fibre Types - Physiopedia - physio-pedia.com
- Skeletal muscle - Wikipedia - en.wikipedia.org
- Slow twitch and fast twitch muscle fibers: Video, Causes, & Meaning - osmosis.org
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