Question: what are t tubules and the sarcoplasmic reticulum?
Answer: The function of T-TUBULES is to conduct impulses from the surface of the cell (SARCOLEMMA) down into the cell and, specifically, to another structure in the cell called the SARCOPLASMIC RETICULUM. ... But the primary function of the SARCOPLASMIC RETICULUM is to STORE CALCIUM IONS.