Explain the relationship between muscle fibre types and the production of movement. (4 marks)
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Sample Answer
Structural Characteristics
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Type I fibres have more mitochondria and are smaller in diameter, allowing them to contract steadily but with less force, making them suited for postural control and sustained movements.
- Type II fibres are larger in diameter with fewer mitochondria, enabling them to contract quickly and produce greater force for powerful movements like jumping or lifting.
Production of movement
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These fibre types work together but are recruited differently.
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Type I fibres are recruited first for basic movements and maintaining posture.
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When more force is required, Type II fibres are recruited to produce more powerful movements.
-
-
This relationship between fibre types allows for a range of movement capabilities, from maintaining balance to producing explosive actions.
Sample Answer
Structural Characteristics
-
Type I fibres have more mitochondria and are smaller in diameter, allowing them to contract steadily but with less force, making them suited for postural control and sustained movements.
- Type II fibres are larger in diameter with fewer mitochondria, enabling them to contract quickly and produce greater force for powerful movements like jumping or lifting.
Production of movement
-
These fibre types work together but are recruited differently.
-
Type I fibres are recruited first for basic movements and maintaining posture.
-
When more force is required, Type II fibres are recruited to produce more powerful movements.
-
-
This relationship between fibre types allows for a range of movement capabilities, from maintaining balance to producing explosive actions.