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Sliding filament theory

Quiz by eve

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10 questions
Show answers
  • Q1
    What is the sliding filament theory?
    A theory for how muscle fibers generate force by sliding actin and myosin filaments past each other.
    A theory for how muscle fibers repair themselves after injury.
    A theory for how muscle fibers generate electricity.
    A theory for how muscle fibers contract and relax.
    30s
  • Q2
    What is the role of ATP in the sliding filament theory?
    ATP is used to break down actin and myosin filaments at the end of a muscle contraction.
    ATP helps to anchor the filaments in place within the muscle fiber.
    ATP provides energy for myosin heads to bind to actin and pull the filaments past each other.
    ATP is not involved in the sliding filament theory.
    30s
  • Q3
    What happens when a muscle contracts according to the sliding filament theory?
    The sarcomere shortens as actin and myosin filaments slide past each other, causing the muscle fiber to contract.
    The sarcomere shortens as actin and myosin filaments remain stationary, causing the muscle fiber to contract.
    The sarcomere lengthens as actin and myosin filaments slide past each other, causing the muscle fiber to contract.
    The sarcomere stays the same length as actin and myosin filaments slide past each other, causing the muscle fiber to contract.
    30s
  • Q4
    What is the name of the protein that binds to actin and helps to regulate muscle contraction according to the sliding filament theory?
    Myosin.
    Actinin.
    Tropomyosin.
    Titin.
    30s
  • Q5
    What happens to tropomyosin when calcium ions are present in the muscle fiber?
    Calcium ions have no effect on tropomyosin.
    Calcium ions bind to troponin, causing a conformational change that moves tropomyosin away from the binding site on actin, allowing myosin heads to bind and initiate muscle contraction.
    Calcium ions bind directly to tropomyosin, causing a conformational change that allows it to bind to myosin heads and initiate muscle contraction.
    Calcium ions break down tropomyosin into its component amino acids, allowing myosin heads to bind and initiate muscle contraction.
    30s
  • Q6
    What is the name of the protein that hydrolyzes ATP to provide energy for muscle contraction?
    Titin ATPase.
    Tropomyosin ATPase.
    Myosin ATPase.
    Actin ATPase.
    30s
  • Q7
    What happens to myosin heads during muscle contraction according to the sliding filament theory?
    Myosin heads do not move during muscle contraction.
    Myosin heads detach from actin and move freely within the muscle fiber.
    Myosin heads break down into their component amino acids.
    Myosin heads bind to actin and use ATP hydrolysis to pull the filaments past each other, generating force.
    30s
  • Q8
    What is the name of the dark bands in striated muscle fibers that contain thick myosin filaments?
    Z-discs.
    H-zones.
    I-bands.
    A-bands.
    30s
  • Q9
    What is the name of the light bands in striated muscle fibers that contain thin actin filaments?
    Z-discs.
    A-bands.
    I-bands.
    H-zones.
    30s
  • Q10
    What is the name of the protein that forms the backbone of the thin actin filaments in muscle fibers?
    T-actin.
    F-actin.
    G-actin.
    R-actin.
    30s

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