Muscle Physiology Quiz
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Questions and Answers

What is the primary function of muscle spindles?

  • Detect changes in muscle length (correct)
  • Regulate muscle stiffness
  • Provide sensory feedback to the skin
  • Stimulate muscle growth

    • Which type of fibers are primarily involved in motor function supplied by mixed nerves?

  • Epsilon Fibers
  • Delta Fibers
  • Alpha Fibers (correct)
  • Beta Fibers

    • What percentage of a mixed nerve's composition is available for motor functions?

  • 70%
  • 40%
  • 60% (correct)
  • 50%

    • The Golgi tendon organ primarily works with which structures to regulate muscle stiffness?

    <p>Muscle spindles</p> Signup and view all the answers

    What is the role of afferent nerve fibers in relation to muscle spindles?

    <p>They relay length information to the CNS</p> Signup and view all the answers

    Which type of fibers arise from specialized sensory endings within muscles or tendons?

    <p>Myelinated fibers</p> Signup and view all the answers

    Which sensory information can be processed by the brain as proprioception?

    <p>Length changes detected by muscle spindles</p> Signup and view all the answers

    The majority of sensory information in a mixed nerve is supplied by which component?

    <p>Myelinated sensory fibers</p> Signup and view all the answers

    What is the primary function of visceral smooth muscle?

    <p>To contract and relax in a rhythmic motion</p> Signup and view all the answers

    Which structure connects groups of cardiac muscles allowing them to contract together?

    <p>Intercalated discs</p> Signup and view all the answers

    Which of the following is true about cardiac muscle tissue?

    <p>Has the ability to contract spontaneously</p> Signup and view all the answers

    What two layers typically encase large muscle groups?

    <p>Superficial and deep fascia</p> Signup and view all the answers

    What is the role of fascia in muscle organization?

    <p>Surrounds and binds individual muscles together</p> Signup and view all the answers

    Which of the following statements about visceral smooth muscle is incorrect?

    <p>It responds only to hormone stimulation</p> Signup and view all the answers

    Which structure closely surrounds individual skeletal muscles?

    <p>Epimysium</p> Signup and view all the answers

    Smooth muscle fibers in organs typically contract in which manner?

    <p>Synchronously with other fibers</p> Signup and view all the answers

    What is the movement of bending a body part called?

    <p>Flexion</p> Signup and view all the answers

    Which term describes the action of moving a body part away from the anatomical position?

    <p>Abduction</p> Signup and view all the answers

    Which arrangement of muscle fascicles is characterized by being parallel to the long axis of the muscle?

    <p>Parallel</p> Signup and view all the answers

    What is the movement called when the palm of the hand is turned upward?

    <p>Supination</p> Signup and view all the answers

    What does dorsiflexion refer to in terms of foot movement?

    <p>Pointing the toes up</p> Signup and view all the answers

    Which type of muscle fascicle arrangement allows for adaptable movement in various directions due to its broad area convergence?

    <p>Convergent</p> Signup and view all the answers

    What action describes the movement of pointing the toes downwards?

    <p>Plantar flexion</p> Signup and view all the answers

    Which of the following movements involves turning the sole of the foot laterally?

    <p>Eversion</p> Signup and view all the answers

    Which muscle is responsible for closing the eyelids gently?

    <p>Orbicularis oculi (palpebral part)</p> Signup and view all the answers

    What action is primarily performed by the risorius and depressor labii inferioris muscles together?

    <p>Produces a toothy smile</p> Signup and view all the answers

    Which muscle draws the eyebrow medially and inferiorly, creating vertical wrinkles above the nose?

    <p>Corrugator supercilii</p> Signup and view all the answers

    What is the primary action of the front belly of the occipitofrontalis muscle?

    <p>Wrinkles the skin of the forehead</p> Signup and view all the answers

    Which muscle functions to depress the medial end of the eyebrow and wrinkles the skin over the dorsum of the nose?

    <p>Procercus plus transverse part of nasalis</p> Signup and view all the answers

    What describes the arrangement of fascicles in circular muscles?

    <p>Fascicles arranged concentrically around an opening</p> Signup and view all the answers

    What happens to the diameter of an opening when circular muscles contract?

    <p>The diameter of the opening decreases</p> Signup and view all the answers

    Which muscle is an example of a circular muscle?

    <p>Orbicularis oris</p> Signup and view all the answers

    What distinguishes pennate muscles from parallel muscles?

    <p>Pennate muscles have more muscles fibers but produce less movement</p> Signup and view all the answers

    Which type of pennate muscle has fascicles on both sides of the tendon?

    <p>Bipennate</p> Signup and view all the answers

    Which of the following types of muscle fascicle arrangements can be described as shaped like a feather?

    <p>Pennate</p> Signup and view all the answers

    What is the primary function of circular muscles in relation to body openings?

    <p>Acting as valves for organs</p> Signup and view all the answers

    Which characteristic is true of unipennate muscles?

    <p>Fascicles are located on one side of the tendon</p> Signup and view all the answers

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