The Sliding Filament Theory
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Questions and Answers

Which of the following best describes the sliding filament theory?

  • The contraction of skeletal muscle is caused by the overlapping of thick and thin filaments.
  • The cross-bridge cycle is responsible for muscle contraction.
  • The sliding of actin past myosin generates muscle tension. (correct)
  • The shortening of the sarcomere results in the shortening of the actin filament length.

    • What is the role of actin in muscle contraction according to the sliding filament theory?

  • Actin generates muscle tension by sliding past myosin. (correct)
  • Actin is responsible for the cross-bridge cycle.
  • Actin shortens the sarcomere and the muscle.
  • Actin is tethered at each end of the sarcomere to z discs.

    • How does the shortening of the sarcomere contribute to muscle contraction?

  • The shortening of the sarcomere allows actin to slide past myosin.
  • The shortening of the sarcomere generates tension and results in muscle contraction. (correct)
  • The shortening of the sarcomere results in the shortening of the actin filament length.
  • The shortening of the sarcomere activates the cross-bridge cycle.

    • Study Notes

    Muscle Contraction

    • The sliding filament theory proposes that muscle contraction occurs when actin and myosin filaments slide past each other, resulting in muscle shortening.
    • According to the sliding filament theory, actin plays a crucial role in muscle contraction by forming a dynamic complex with myosin, allowing for the sliding of filaments.
    • The shortening of the sarcomere, the functional unit of muscle contraction, contributes to muscle contraction by reducing the distance between the Z-disks, leading to muscle fiber shortening.

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    Description

    Test your knowledge on the Sliding Filament Theory and its relationship to muscle contraction. This quiz explores the cross-bridge cycle, overlapping of filaments, and the generation of muscle tension.

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