CH 6: Muscle structure and function
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Questions and Answers

What are the basic units of a muscle?

  • Myofibrils (correct)
  • Muscle fibers
  • Sarcomeres
  • Fascicles
  • What type of connective tissue surrounds muscle fibers in bundles called fascicles?

  • Endomysium
  • Epimysium
  • Perimysium (correct)
  • Sarcolemma
  • Which protein filament within the sarcomeres is primarily made up of actin?

  • Titin filaments
  • Actin filaments (correct)
  • Myosin filaments
  • Tropomyosin filaments
  • What type of muscle tissue is characterized by a striped appearance due to alternating light and dark bands?

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

    What type of muscle tissue is composed of multiple fascicles enclosed by epimysium, forming an entire muscle?

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

    Which filament changes length during muscle contraction?

    <p>Actin filaments</p> Signup and view all the answers

    Which process provides the energy for muscle contraction?

    <p>Cellular respiration</p> Signup and view all the answers

    Which structure stores and releases calcium ions during muscle contraction?

    <p>Sarcoplasmic reticulum</p> Signup and view all the answers

    What is the role of ATP in muscle contraction?

    <p>ATP provides energy for the myosin heads to bind to actin</p> Signup and view all the answers

    Which organelle provides energy during muscle contraction?

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

    What is the hierarchical order of muscle structure from basic unit to the entire muscle?

    <p>Myofibrils, Muscle Fibers, Muscle, Fascicles</p> Signup and view all the answers

    Which protein filament is responsible for muscle contraction by interacting with actin filaments?

    <p>Myosin Filaments</p> Signup and view all the answers

    Which connective tissue surrounds bundles of muscle fibers known as fascicles?

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

    What gives muscle fibers their characteristic striped appearance?

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

    What is the primary component of myosin filaments involved in muscle contraction?

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

    What is the primary function of the sarcoplasmic reticulum in muscle cells?

    <p>To store and release calcium ions</p> Signup and view all the answers

    During muscle contraction, what causes the actin filaments to move?

    <p>The myosin filaments slide over the actin filaments</p> Signup and view all the answers

    Which structure in muscle fibers contains organelles that provide energy during muscle contraction?

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

    What is the source of energy that powers muscle contraction?

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

    What happens to the length of the sarcomeres during muscle contraction?

    <p>They shorten</p> Signup and view all the answers

    What is the primary function of myosin filaments in muscle contraction?

    <p>Releasing energy</p> Signup and view all the answers

    Which connective tissue surrounds muscle fibers in bundles called fascicles?

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

    What is the hierarchical order of muscle structure from the basic unit to the entire muscle?

    <p>Myofibrils, muscle fibers, muscle, fascicles</p> Signup and view all the answers

    Which organelle provides energy during muscle contraction?

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

    During muscle contraction, what causes the actin filaments to move?

    <p>Movement of myosin filaments</p> Signup and view all the answers

    What is the primary function of the sarcoplasm in muscle fibers during contraction?

    <p>To provide the energy required for myosin heads to bind to actin</p> Signup and view all the answers

    Which of the following processes is responsible for generating ATP during muscle contraction?

    <p>Cellular respiration</p> Signup and view all the answers

    What is the role of ATP in the interaction between myosin and actin filaments during muscle contraction?

    <p>It provides energy for the myosin heads to bind to actin</p> Signup and view all the answers

    Which structure is responsible for releasing calcium ions during muscle contraction?

    <p>Sarcoplasmic reticulum</p> Signup and view all the answers

    What is the primary role of the sarcoplasmic reticulum in muscle cells?

    <p>To store and release calcium ions</p> Signup and view all the answers

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