Muscle Anatomy and Functions Quiz
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Muscle Anatomy and Functions Quiz

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Questions and Answers

Which type of muscle is primarily responsible for involuntary movement within organs?

  • Smooth muscle (correct)
  • Skeletal muscle
  • Cardiac muscle
  • Striated muscle

    • What is the primary role of tendons in the musculoskeletal system?

  • Connect muscle to bone (correct)
  • Allow for muscle contraction
  • Support joint stability
  • Attach muscle to muscle

    • Which component is typically the fixed attachment point of a muscle during contraction?

  • Tendon
  • Insertion
  • Joint
  • Origin (correct)

    • How are skeletal muscles primarily arranged in the body?

    <p>They often work in coordinated groups.</p> Signup and view all the answers

    Which of the following best describes an isotonic contraction?

    <p>Muscle shortens or lengthens during contraction.</p> Signup and view all the answers

    What occurs during concentric isotonic contraction?

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

    Which of the following statements is true about eccentric contractions?

    <p>They are beneficial for increasing muscle damage.</p> Signup and view all the answers

    What is a key characteristic of muscle during eccentric isotonic contraction?

    <p>The muscle lengthens</p> Signup and view all the answers

    What type of muscles are arranged in antagonistic pairs?

    <p>Skeletal muscles</p> Signup and view all the answers

    How does the strength of muscles during eccentric contractions compare to concentric contractions?

    <p>Muscles are approximately 10% stronger during eccentric contractions.</p> Signup and view all the answers

    Which muscle is responsible for flexing the arm at the elbow?

    <p>Biceps Brachii</p> Signup and view all the answers

    What effect does heavy eccentric loading have on muscles?

    <p>It may cause greater muscle damage when overloaded.</p> Signup and view all the answers

    What is the primary function of the extensor muscle?

    <p>Opens a joint</p> Signup and view all the answers

    What connects the muscle fibers within each muscle to facilitate contractions?

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

    What distinguishes cardiac muscle from skeletal muscle?

    <p>Cardiac muscle is involuntary</p> Signup and view all the answers

    What type of connective tissue sheath surrounds each muscle?

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

    Which of the following is NOT a characteristic of smooth muscle?

    <p>Contains intercalated discs</p> Signup and view all the answers

    During a muscle biopsy, what is primarily being analyzed?

    <p>Histological properties of muscle tissue</p> Signup and view all the answers

    What characterizes high endurance muscle?

    <p>1 centrally placed nucleus per cell</p> Signup and view all the answers

    What is the duration of the twitch response in the frog gastrocnemius muscle?

    <p>0.1 sec</p> Signup and view all the answers

    What is the functional unit of skeletal muscle?

    <p>Motor unit</p> Signup and view all the answers

    What occurs during the latent period of muscle contraction?

    <p>There is no visible reaction to the stimulus.</p> Signup and view all the answers

    Which describes the all-or-nothing response of muscle contraction?

    <p>Contraction occurs only if the neuron stimulates the muscle fibre</p> Signup and view all the answers

    What is true about motor units and dexterity?

    <p>Fewer muscle fibres per motor unit lead to increased dexterity</p> Signup and view all the answers

    What is the refractory period in muscle physiology?

    <p>0.002 sec</p> Signup and view all the answers

    What phenomenon occurs when stimulation at a frequency shorter than the twitch time results in the second stimulus being superimposed on the first?

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

    What type of contraction occurs when the muscle length changes?

    <p>Isotonic contraction</p> Signup and view all the answers

    How can summation in whole muscle occur?

    <p>By increasing the number of motor units involved</p> Signup and view all the answers

    What role does asynchronous firing of motor units play during muscle contraction?

    <p>It ensures smooth, graded responses</p> Signup and view all the answers

    At what frequency do the twitches begin to fuse together in a state of maximal contraction called tetanus?

    <p>40 pulses/sec</p> Signup and view all the answers

    What is the average number of muscle fibres per motor unit in the human body?

    <p>150 fibres/MU</p> Signup and view all the answers

    What is wave summation in muscle contraction?

    <p>Contractions that become superimposed upon one another</p> Signup and view all the answers

    Where is the neuromuscular junction located?

    <p>Between the motor neuron and muscle fibre</p> Signup and view all the answers

    What role does asynchronous firing of motor units play during muscle contraction?

    <p>It contributes to both motor unit summation and wave summation.</p> Signup and view all the answers

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