9.4: Activity 3

Integrated Human Anatomy and Physiology Lab Manual I: Fundamentals of Structure and Movement · LibreTexts

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    Muscle Contraction Role Play: The Sliding Filament Theater

    To grasp the sliding filament theory of muscle contraction in a fun and interactive way, this role playing activity allows students to embody the components of muscle contraction. By stepping into the shoes (or roles) of actin, myosin, calcium ions, and ATP, students will learn about the dynamic interactions that occur during muscle movement.

    Objective

    Materials Needed

    • Costumes/Props: Simple items to represent different components (for example colored headbands, paper cutouts, or scarves).
      • Actin: Green headbands or scarves.
      • Myosin: Yellow headbands or scarves.
      • Calcium ions: Small balls or tokens.
      • ATP: Flashlights (to represent energy).
    • Space: A large area for movement and interaction.
    • Script/Guidelines: A handout explaining each role and the sequence of actions.

    Detailed Activity Steps

    • Brief explanation of the sliding filament theory and the roles of actin, myosin, calcium ions, and ATP in muscle contraction.
    • Students are divided into into groups based on the roles:
      • Actin: The filaments that slide and provide structure.
      • Myosin: The heads that pull on actin to create contraction.
      • Calcium ions: The activators that initiate the contraction process.
      • ATP: The energy provider that powers the movement.
    • Students are given a few minutes to come up with a simple costume or prop to represent their roles.
    • Explaining the sequence of actions:
      • Actin stands in a line, representing the muscle fiber.
      • Myosin will approach Actin and mimic the pulling action.
      • Calcium ions will move to activate Myosin, represented by throwing their tokens (the small balls) toward them.
      • ATP will shine their flashlights on Myosin when energy is needed for movement.

    Note: Emphasize that the act of pulling should be synchronized, demonstrating how myosin heads interact with actin.

    • Simulation starts with a countdown.
    • Calcium ions activate the contraction by throwing their tokens to Myosin.
    • Myosin will then move toward Actin and simulate pulling them inward.
    • After a few seconds, the ATP group shines their flashlights to signify the need for energy, allowing Myosin to pause and "reset" (relaxation phase).
    • The cycle is repeated a few times to show both contraction and relaxation.
    • Summarize the key takeaways from the role play, reinforcing how the actin and myosin interaction works during muscle movement.

    This page titled 9.4: Activity 3 was last modified on Thu, 28 Aug 2025 05:08:10 GMT and is shared under a CC BY-NC 4.0 license and was authored, remixed, and/or curated by Lakshmikanta Sengupta and Susmita Sengupta.