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 (A)</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 (C)</p> Signup and view all the answers

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

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

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

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

Which of the following is true about cardiac muscle tissue?

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

What two layers typically encase large muscle groups?

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

What is the role of fascia in muscle organization?

<p>Surrounds and binds individual muscles together (C)</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 (B)</p> Signup and view all the answers

Which structure closely surrounds individual skeletal muscles?

<p>Epimysium (A)</p> Signup and view all the answers

Smooth muscle fibers in organs typically contract in which manner?

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

What is the movement of bending a body part called?

<p>Flexion (B)</p> Signup and view all the answers

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

<p>Abduction (D)</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 (A)</p> Signup and view all the answers

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

<p>Supination (C)</p> Signup and view all the answers

What does dorsiflexion refer to in terms of foot movement?

<p>Pointing the toes up (C)</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 (A)</p> Signup and view all the answers

What action describes the movement of pointing the toes downwards?

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

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

<p>Eversion (C)</p> Signup and view all the answers

Which muscle is responsible for closing the eyelids gently?

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

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

<p>Corrugator supercilii (C)</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 (D)</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 (C)</p> Signup and view all the answers

What describes the arrangement of fascicles in circular muscles?

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

Which muscle is an example of a circular muscle?

<p>Orbicularis oris (B)</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 (D)</p> Signup and view all the answers

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

<p>Bipennate (B)</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 (D)</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 (B)</p> Signup and view all the answers

Which characteristic is true of unipennate muscles?

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

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