Question
In skeletal muscle, what is a minimum unit of contraction caused by a single action potential called?
Summation
Tension
Tetanus
Twitch
Summation
Tension
Tetanus
Twitch
Ask by Ross Matthews. in the United States
Mar 23,2025
Upstudy AI Solution
Tutor-Verified Answer
Answer
A single action potential in skeletal muscle causes a twitch.
Solution
The minimum unit of contraction in skeletal muscle caused by a single action potential is called a Twitch.
Here’s a brief explanation of the other terms for clarity:
- Summation: This refers to the process where multiple action potentials lead to increased muscle tension due to the additive effect of twitches.
- Tension: This is the force generated by muscle contraction but does not refer to a specific unit of contraction.
- Tetanus: This is a sustained muscle contraction resulting from a series of rapid action potentials, leading to a state of continuous contraction.
Thus, the correct answer is Twitch.
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Simplify this solution Extra Insights
The minimum unit of contraction in skeletal muscle triggered by a single action potential is known as a “twitch.” This brief contraction occurs when a muscle fiber responds to a single stimulus, leading to a short, rapid contraction followed by relaxation. It’s like a quick burst of energy that gets the muscle ready for more substantial activity!
Muscles are quite the performers; they don’t just work in isolation! When you find yourself lifting something heavy, your muscles often experience “twitches” in rapid succession. This is what we call summation, where the muscle fibers are stimulated multiple times before they fully relax. By stacking those twitches together, your muscles produce a stronger overall contraction—perfect for tackling big tasks!
