junctional feet

'junctional feet' can also refer to...


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Knob-like structures in muscle fibres connecting transverse tubules (T-tubules) with the sarcoplasmic reticulum. It has been hypothesized that the junctional feet undergo a conformational change on the arrival of an electrical impulse at the T-tubule, causing adjacent calcium channel proteins to open. This allows calcium ions to diffuse inside the muscle fibre, enabling a muscle action to take place (see sliding filament theory).

Subjects: Sports and Exercise Medicine.

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