Could you help me answer this question? Thank you

You are learning the terminology of muscle microstructure and function. Words like sarcolemma, sarcoplasm, sarcomere, myofibril, myosin, actin, A band, I band, Z-membrane, H-zone, M-line, T-tubule, etc. are no longer like a foreign language to you (hopefully)! Given your familiarity with this collage of terms, provide the basic function of the T-tubules.

A. They conduct the wave of depolarization from the muscle fiber membrane to the myofibril;

B. They release calcium ions into the sarcoplasm during depolarization of the muscle cell;

C. They release ATP into the cisternae of the sarcoplasmic reticulum;

D. They are primarily conduits for calcium ions;

E. They pump calcium ions back into the sarcoplasmic reticulum from the sarcoplasm.

Please explain why the answer is correct and why the remaining choices are incorrect

A. They conduct the wave of depolarization from the muscle fiber membrane to the myofibril;

T tubules are present deep into the skeletal muscles and contain ions channels, pumps. Their function is to the transmission of the nerve impulse to deeper into myofibrils from the sarcolemma of muscle fiber membrane and controls the contraction of the muscles.

Sarcoplasmic reticulum stores the calcium ions and releases it into the sarcoplasm during depolarization and is the main channel of calcium ions in the muscles. The calcium pump (Sarcoplasmic reticulum ATPases ) is also present inside the sarcoplasmic reticulum which pumps calcium back into sarcoplasmic reticulum using ATP so that concentration of the calcium decrease in the actin and myosin filaments which helps to relax the muscle. All of the below three statements are incorrect because these functions are controlled by sarcoplasmic reticulum.

B. They release calcium ions into the sarcoplasm during depolarization of the muscle cell;

C. They release ATP into the cisternae of the sarcoplasmic reticulum; ( ATPase pump release this )

D. They are primarily conduits for calcium ions;

E. They pump calcium ions back into the sarcoplasmic reticulum from the sarcoplasm.