ZoologyDuring muscle contraction, the active binding sites for myosin on the actin filaments are unmasked when

During muscle contraction, the active binding sites for myosin on the actin filaments are unmasked when

  1. A

    Ca2+ binds to tropomyosin

  2. B

    Ca2+ binds to troponin

  3. C

    ATP binds to heavy meromyosin

  4. D

    ATP binds to light meromyosin

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    Solution:

    When the muscle is relaxed, the active binding sites for myosin on the actin filaments are masked by tropomyosin. They are exposed when Ca2+ ions bind to TnC.

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