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Looking at this diagram explain the order of size dependent recruitment of motor units during muscle contraction. Explain which one is recruited first and which is recruited at the end? Skeletal muscle fibers Time Small- fiber motor units recruited Medium- fiber motor units recruited Large- fiber motor units recruited Tension

Looking at this diagram explain the order of size dependent recruitment of motor units during muscle contraction. Explain which one is recruited first and which is recruited at the end? Skeletal muscle fibers Time Small- fiber motor units recruited Medium- fiber motor units recruited Large- fiber motor units recruited Tension

Human Anatomy & Physiology (11th Edition)
Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
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The image presents a concept diagram illustrating the size-dependent recruitment of motor units during muscle contraction. **Text:** "Looking at this diagram, explain the order of size-dependent recruitment of motor units during muscle contraction. Explain which one is recruited first and which is recruited at the end?" **Diagram Explanation:** The diagram features a graph with two axes: "Tension" on the vertical axis and "Time" on the horizontal axis. It illustrates three stages of motor unit recruitment in skeletal muscle fibers. 1. **Small-fiber motor units recruited:** - Initially, small motor units are activated, indicated by a green line that rises first on the graph. This represents the beginning of muscle tension development. 2. **Medium-fiber motor units recruited:** - As the contraction progresses, medium-sized motor units are recruited next. This is denoted by a blue line that joins the green line, showing increased tension. 3. **Large-fiber motor units recruited:** - Finally, large motor units are activated, represented by an orange line, leading to the highest level of tension. This occurs at the end of the recruitment sequence. The diagram effectively demonstrates the systematic activation of motor units from smallest to largest as muscle tension increases over time.
Transcribed Image Text:The image presents a concept diagram illustrating the size-dependent recruitment of motor units during muscle contraction. **Text:** "Looking at this diagram, explain the order of size-dependent recruitment of motor units during muscle contraction. Explain which one is recruited first and which is recruited at the end?" **Diagram Explanation:** The diagram features a graph with two axes: "Tension" on the vertical axis and "Time" on the horizontal axis. It illustrates three stages of motor unit recruitment in skeletal muscle fibers. 1. **Small-fiber motor units recruited:** - Initially, small motor units are activated, indicated by a green line that rises first on the graph. This represents the beginning of muscle tension development. 2. **Medium-fiber motor units recruited:** - As the contraction progresses, medium-sized motor units are recruited next. This is denoted by a blue line that joins the green line, showing increased tension. 3. **Large-fiber motor units recruited:** - Finally, large motor units are activated, represented by an orange line, leading to the highest level of tension. This occurs at the end of the recruitment sequence. The diagram effectively demonstrates the systematic activation of motor units from smallest to largest as muscle tension increases over time.
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