What is the T-system in muscle contraction?

During the excitation-contraction coupling in skeletal muscle   :-
  
1.  The T-tubules or transverse tubules contains voltage-gated calcium channels causes depolarisation of the membrane by responding to it.

2.  When the T-tubules conduct action potentials,this leads to the conformational change in the  calcium channels in the T-tubules which then directly causes the opening of calcium channels in the sarcoplasmic reticulum.

3. Ultimately releases calcium into the cytoplasm , raising cytoplasmic calcium  concentration which then binds to troponin and stimulates muscle contraction .

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In response to stimulation, calcium channels in t-tubules open and allow calcium to flow down it's electro-chemical gradient into the cell. In skeletal muslce it contributes greatly to muscle contraction. 

The purpose of t-tubules is to allow depolarization to quickly penetrate to the interior of the cell. The t-tubules help to bring the extracellular environment to all parts of the muscle cell more quickly which better coordinates muscle contraction.
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