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Questions and Answers
What type of muscle contraction results in tension remaining unchanged and length shortening?
What type of muscle contraction results in tension remaining unchanged and length shortening?
- Eccentric
- Concentric
- Isometric
- Isotonic (correct)
What is the duration of the latent period in a simple muscle twitch?
What is the duration of the latent period in a simple muscle twitch?
- 2 ms (correct)
- 50 ms
- 10 ms
- 40 ms
What type of muscle stimulation involves nerve stimulation resulting in muscle contraction?
What type of muscle stimulation involves nerve stimulation resulting in muscle contraction?
- Reciprocal inhibition
- Direct muscle stimulation
- Autogenic inhibition
- Indirect muscle stimulation (correct)
What is the total time of a simple muscle twitch?
What is the total time of a simple muscle twitch?
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Which structure(s) obey the all or none rule?
Which structure(s) obey the all or none rule?
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Study Notes
Muscle Contractions
- Isotonic Contraction: Characterized by a change in muscle length while maintaining constant tension.
Muscle Twitch
- Latent Period Duration: The latent period in a simple muscle twitch typically lasts about 2 milliseconds.
- Total Time of a Simple Muscle Twitch: A simple muscle twitch lasts approximately 100 milliseconds.
Muscle Stimulation
- Nerve Stimulation: Involves electrical impulse transmission from nerves, leading to muscle contraction.
All-or-None Rule
- Applicability of the All-or-None Rule: This rule applies to muscle fibers, meaning that when a fiber is stimulated above a certain threshold, it contracts maximally or not at all.
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