Microscopic Structure of Skeletal Muscle Tissue Quiz
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Microscopic Structure of Skeletal Muscle Tissue Quiz

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Questions and Answers

What protein blocks the myosin binding sites on actin when the muscle is at rest?

  • Troponin
  • Calcium
  • Myosin
  • Tropomyosin (correct)

    • Which protein senses rises in calcium concentration and forces tropomyosin to change its shape?

  • Myosin
  • Troponin (correct)
  • Actin
  • Tropomyosin

    • What type of contraction occurs when a muscle shortens to do work?

  • Eccentric contraction
  • Isotonic contraction
  • Isometric contraction
  • Concentric contraction (correct)

    • Where do motor neurons innervate skeletal muscle tissue?

    <p>Sarcolemma of the muscle fiber</p> Signup and view all the answers

    Which neurotransmitter is stored in the terminal boutons?

    <p><strong>Acetylcholine</strong></p> Signup and view all the answers

    What is the center part of the A band where no thin filaments occur?

    <p>H zone</p> Signup and view all the answers

    Which filaments are located in the center of the sarcomere?

    <p>Thick (myosin) filaments</p> Signup and view all the answers

    What is the full length of the thick filament in a sarcomere called?

    <p>A band</p> Signup and view all the answers

    During muscle contraction, which filaments interact with each other?

    <p>Both thin and thick filaments</p> Signup and view all the answers

    Which component holds the thick filaments together at the center of the H zone?

    <p>M line</p> Signup and view all the answers

    In which region of a sarcomere do thin filaments extend from Z disc toward the center?

    <p>Z disc</p> Signup and view all the answers

    What is a muscle twitch?

    <p>An uncontrollable contraction of a small portion of a muscle</p> Signup and view all the answers

    Which protein is affected in Duchenne muscular dystrophy (DMD)?

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

    What is the most common form of muscular dystrophy?

    <p>Duchenne muscular dystrophy (DMD)</p> Signup and view all the answers

    What happens when the protein dystrophin is mutated in DMD?

    <p>The sarcolemma weakens and tears</p> Signup and view all the answers

    What is the characteristic symptom onset age for Duchenne muscular dystrophy (DMD)?

    <p>Between 2 and 7 years</p> Signup and view all the answers

    What causes pain in Myofascial Pain Syndrome?

    <p>Tightened bands of muscle fibers with trigger points</p> Signup and view all the answers

    What are four functional properties that distinguish muscle tissue from other tissues?

    <p>Ability to contract, extensibility, elasticity, excitability</p> Signup and view all the answers

    Which layers of connective tissue occur in and around skeletal muscle?

    <p>Endomysium, perimysium, epimysium, fascicles</p> Signup and view all the answers

    Which symptoms are associated with myofascial pain syndrome?

    <p>Sharp or aching pain in muscles, trigger points, restricted movement</p> Signup and view all the answers

    What are some symptoms commonly associated with delayed-onset muscle soreness?

    <p>Pain and stiffness 12-24 hours after intense exercise</p> Signup and view all the answers

    How do muscles attach at their origins and insertions?

    <p>Through tendons attaching muscle to bone or cartilage</p> Signup and view all the answers

    What is the primary tissue in the walls of hollow organs?

    <p>Smooth muscle tissue</p> Signup and view all the answers

    Which prefix means 'muscle'?

    <p>Myo-</p> Signup and view all the answers

    Which type of muscle tissue is responsible for maintaining posture and stabilizing joints?

    <p>Skeletal muscle tissue</p> Signup and view all the answers

    What is the term for the plasma membrane of muscle cells?

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

    Which type of muscle tissue has a 'fusiform' appearance?

    <p>Smooth muscle tissue</p> Signup and view all the answers

    What is responsible for shortening muscle cells?

    <p>Myofilaments comprising actin or myosin proteins</p> Signup and view all the answers

    Which type of muscle tissue is involuntary in nature?

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

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