Exercise Physiology Chapter 11 Quiz

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  • 1/6 Questions

    The somatic nervous system innervates:

    • Involuntary muscles
    • Cardiac muscle
    • Skeletal muscle and voluntary muscles
    • None of the above
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About This Quiz

This Exercise Physiology Chapter 11 Quiz assesses knowledge on neuromuscular physiology, focusing on muscle innervation, movement mechanisms, and sensory feedback. It is designed for learners to understand muscle dynamics and sensory responses crucial for advanced studies in exercise science.

Exercise Physiology Chapter 11 Quiz - Quiz

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  • 2. 

    The gradation of force principle states that the force of muscle action varies from slight to maximal by which of the following mechanisms:

    • Increasing the number of motor units

    • Decreasing the number of motor units

    • Increasing the frequency of motor unit discharge

    • Both a and c

    Correct Answer
    A. Both a and c
    Explanation
    The gradation of force principle states that the force of muscle action can vary from slight to maximal. This is achieved by two mechanisms: increasing the number of motor units and increasing the frequency of motor unit discharge. By recruiting more motor units and increasing the frequency of their discharge, the muscle can generate a greater force. Therefore, the correct answer is both a and c.

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  • 3. 

    What provides mechanosensory information about changes in muscle fiber length and tension?

    • Joints

    • Golgi tendon organs

    • Ligaments

    • Muscle spindles

    Correct Answer
    A. Muscle spindles
    Explanation
    Muscle spindles are sensory receptors located within the muscle fibers that provide information about changes in muscle fiber length and tension. They are responsible for detecting the stretch and contraction of muscles, allowing the body to have proprioception and awareness of the position and movement of the muscles. This information is crucial for coordinating muscle contractions and maintaining balance and posture.

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  • 4. 

    Less complex movements such as  forearm supination and elbow flexion:

    • Have a lower ratio of muscle fibers to motor nerves

    • Have a higher ratio of muscle fibers to motor nerves

    • Have a lower ratio of muscle fibers to motor nerves than complex eye and hand movements

    • Both b and c

    Correct Answer
    A. Both b and c
    Explanation
    Less complex movements such as forearm supination and elbow flexion have a higher ratio of muscle fibers to motor nerves compared to complex eye and hand movements. This means that these movements require a smaller number of motor nerves to control a larger number of muscle fibers. This suggests that the muscles involved in forearm supination and elbow flexion are more efficient and capable of producing stronger contractions with fewer motor nerves.

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  • 5. 

    A slow oxidative motor unit would probably be activated:

    • While the phosphagen energy system is activated

    • While the glycolysis system is activated

    • While the aerobic oxidative phosphorylation system is activated

    • Both b and c

    Correct Answer
    A. While the aerobic oxidative phosphorylation system is activated
    Explanation
    A slow oxidative motor unit would probably be activated while the aerobic oxidative phosphorylation system is activated. This is because slow oxidative motor units are specialized for endurance activities and rely on the aerobic energy system to produce ATP. The aerobic oxidative phosphorylation system utilizes oxygen to break down glucose and produce ATP, which is ideal for sustained, low-intensity activities. Therefore, it is likely that a slow oxidative motor unit would be activated during this energy system.

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  • 6. 

    What is a specific term used to detect changes in movement or pressure?

    • Joints

    • Ligaments

    • Motor units

    • Pacinian corpuscles

    Correct Answer
    A. Pacinian corpuscles
    Explanation
    Pacinian corpuscles are specific sensory receptors located in the skin and other tissues. They are responsible for detecting changes in movement or pressure. When pressure is applied to the skin, these corpuscles generate electrical signals that are transmitted to the brain, allowing us to perceive and respond to changes in our environment. Joints, ligaments, and motor units are not directly involved in detecting changes in movement or pressure, making them incorrect options.

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  • Jan 24, 2024
    Quiz Edited by
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  • Mar 11, 2012
    Quiz Created by
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