Skeletal Muscle Anatomy and Physiology
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Questions and Answers

What type of muscle contraction occurs when the amount of tension increases despite the muscle length remaining the same?

  • Isotonic
  • Concentric
  • Isometric (correct)
  • Eccentric
  • What is the primary function of myoglobin in muscle fibers?

  • To help bind oxygen in muscle (correct)
  • To increase the speed of muscle contraction
  • To facilitate anaerobic respiration
  • To enhance the strength of muscle contraction
  • What is the term for the non-movable end of a skeletal muscle?

  • Origin (correct)
  • Belly
  • Insertion
  • Agonist
  • Which type of muscle fiber contracts quickly and is adapted for anaerobic respiration?

    <p>Fast twitch fiber</p> Signup and view all the answers

    According to the all or none law, what is the characteristic of a muscle contraction?

    <p>It contracts or doesn't contract, with no in between</p> Signup and view all the answers

    How are muscles typically named in human anatomy?

    <p>According to their location</p> Signup and view all the answers

    What is the primary function of ligaments in the human body?

    <p>To bind bone to bone</p> Signup and view all the answers

    Which of the following is a characteristic of skeletal muscle fibers?

    <p>Many nuclei per cell</p> Signup and view all the answers

    What is the term for the ability of muscles to recoil to their original shape after contraction?

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

    Which of the following is a type of connective tissue that surrounds each muscle fiber?

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

    What is the name of the cell membrane that surrounds muscle fibers?

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

    What percentage of body weight does skeletal muscle make up?

    <p>40%</p> Signup and view all the answers

    What is the primary role of calcium in muscle contraction?

    <p>To bind to troponin and expose attachment sites for myosin</p> Signup and view all the answers

    During muscle contraction, what is the primary function of ATP?

    <p>To provide energy for the sliding of actin and myosin filaments</p> Signup and view all the answers

    What is the term for the shortening of a muscle fiber due to the contraction of its sarcomeres?

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

    What is the name of the enzyme that breaks down acetylcholine, leading to muscle relaxation?

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

    What is the structure that allows the electrical impulse to reach the sarcoplasmic reticulum and trigger muscle contraction?

    <p>T tubules</p> Signup and view all the answers

    What is the term for the process by which actin and myosin filaments slide past each other, resulting in muscle contraction?

    <p>Sliding filament theory</p> Signup and view all the answers

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