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Questions and Answers
Which type of skeletal muscle fiber is generally recruited first during weak contractions?
Which type of skeletal muscle fiber is generally recruited first during weak contractions?
- Fast oxidative (Fast fatigue resistant) – Type II
- Type I Fibres (red fibres)
- Slow oxidative (Slow fatigue resistant) – Type I (correct)
- Fast glycolytic (Fast fatiguing) – Type II
What gives rise to the differences in maximal shortening velocities between fast and slow muscle fibers?
What gives rise to the differences in maximal shortening velocities between fast and slow muscle fibers?
- Variances in the size of sarcomeres in the muscle fibers
- Variations in the number of mitochondria present in the fibers
- Levels of myoglobin concentration in the muscle fibers
- Different myosin enzymes with high or low ATPase activities (correct)
Which type of muscle fiber has a larger average diameter and produces greater tension but also fatigues more rapidly?
Which type of muscle fiber has a larger average diameter and produces greater tension but also fatigues more rapidly?
- Fast oxidative (Fast fatigue resistant) – Type II
- Slow oxidative (Slow fatigue resistant) – Type I
- Fast glycolytic (Fast fatiguing) – Type II (correct)
- Type I Fibres (red fibres)
Which factor determines whether slow-oxidative or fast-glycolytic motor units are recruited during muscle contractions?
Which factor determines whether slow-oxidative or fast-glycolytic motor units are recruited during muscle contractions?
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What characterizes red muscle fibers in terms of myoglobin and mitochondria content?
What characterizes red muscle fibers in terms of myoglobin and mitochondria content?
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What is the function of the isoform of myosin found in red muscle fibers?
What is the function of the isoform of myosin found in red muscle fibers?
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