Questions and Answers
What are isotonic contractions?
Tension rises and the skeletal muscles length changes.
Which of the following are examples of isotonic contractions? (Select all that apply)
What occurs during concentric contractions?
The muscle shortens when stimulated by a load.
What must happen to a muscle before it can shorten during concentric contractions?
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The tension in a muscle remains constant as the muscle fiber shortens.
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What characterizes a light load when concentrically contracting?
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What happens during eccentric contractions?
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Give an example of eccentric contractions.
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How does the muscle lengthen during eccentric contractions?
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What are isometric contractions?
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Provide examples of isometric contractions.
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If the load equals peak tension, the load will move when the muscle contracts.
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What occurs during isometric contractions in terms of muscle fiber and connective tissues?
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Study Notes
Isotonic Contractions
- Involve tension rise while the skeletal muscles change length.
- Include activities like lifting objects, walking, and running.
Concentric Contractions
- Occur when muscles shorten under tension, example: hanging a 2kg weight.
- Require cross bridges in muscles to generate enough tension to overcome the applied load.
- Tension increases until it surpasses the load, allowing the muscle to contract.
Muscle Shortening Characteristics
- Muscle maintains constant tension while shortening.
- Concentric contractions with a light load allow for rapid contraction speeds.
Eccentric Contractions
- Feature muscle elongation while under tension.
- Exemplified by lowering a dumbbell from a flexed position back to an extended position.
- Tension generated by muscles is overcome by the weight being lifted.
Isometric Contractions
- Muscles do not change in length; tension does not exceed the load.
- Crucial during activities that maintain posture, such as sitting or standing.
- When the load equals peak tension, no movement occurs despite muscle contraction.
Fiber and Connective Tissue Responses
- During isometric contractions, muscle fibers shorten while connective tissues stretch.
- This results in an overall widening of the muscle.
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Description
Explore the concepts of isotonic contractions, including concentric, eccentric, and isometric types, through this set of flashcards. Learn definitions, examples, and the mechanics behind muscle movements. Perfect for students looking to understand muscle physiology.
