As a Muscle Is Stretched, the Z Discs Move Further

question 87

Multiple Choice

As a muscle is stretched, the Z discs move further apart, and the I band increases in size. What is the role if titin in this situation?

• A) It prevents the sarcomere from being pulled apart as this stretching occurs.
• B) It prevents the thick filaments from sliding over the thin filaments.
• C) It moves the tropomyosin molecule from the actin filament.
• D) It is required for the release of ATP in this process.

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