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Introduction to Muscular System and Muscle Physiology
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Introduction to Muscular System and Muscle Physiology

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Questions and Answers

What is the function of Troponin I in muscle contraction?

  • Binds other troponin molecules to tropomyosin
  • Inhibits the interaction of actin with myosin (correct)
  • Assists in rapid transmission of action potential
  • Forms the backbone of F-actin

    • What is the main function of the sarcotubular system?

  • Facilitates rapid transmission of action potential (correct)
  • Stores calcium ions
  • Secrete neurotransmitters
  • Initiates action potential

    • What is the composition of the actin filament?

  • Actin, troponin, and tropomyosin (correct)
  • Actin, myosin, and tropomyosin
  • Actin, troponin, and myosin
  • Actin and myosin only

    • What is the arrangement of myofibrils in skeletal muscles called?

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

    What is the structure responsible for ATP production needed for muscle contraction?

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

    What type of muscles contain pacemaker cells and contract rhythmically involuntarily in the heart?

    <p>Cardiac Muscles</p> Signup and view all the answers

    What is the function of the sarcolemma in a muscle fiber?

    <p>To attach to the tendon fibers</p> Signup and view all the answers

    Which type of muscle lacks cross-striations?

    <p>Smooth Muscles</p> Signup and view all the answers

    What are the building blocks of the muscular system?

    <p>Skeletal Muscle Fibers</p> Signup and view all the answers

    How many actin filaments are present in each myofibril?

    <p>~3000</p> Signup and view all the answers

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