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A molecular brake that keeps muscle architecture in check

Every movement we make, from blinking to sprinting, depends on the ability of muscle fibers to contract in a rapid and coordinated way. Achieving this precision requires an intricate internal membrane network known as the transverse tubule, or T-tubule, system. These narrow membrane invaginations carry electrical signals from the cell surface deep into the muscle fiber, where they trigger the release of calcium needed for contraction.

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