Depending on the cell type, extensions of these structures form dyads or triads with adjacent T-tubules and they contain the protein calsequestrin.
Sodium-mediated antiport membrane proteins in these structures can be passively inhibited through the use of digitalis extracts which block sodium-potassium ATPases. They are mechanically coupled to plasma membrane dihydropyridine receptors. Though not found in neurons, they possess ryanodine receptors which can be activated when phospholipase C cleaves PIP2 into DAG and the signaling molecule inositol trisphosphate. Depending on the cell type, extensions of these structures form dyads or triads with adjacent T-tubules and they contain the protein calsequestrin. For 10 points, name these structures found within muscle cells which store intercellular calcium and are a modified form of an organelle that is continuous with the nuclear envelope and comes in a rough form.
Sodium-mediated antiport membrane proteins in these structures can be passively inhibited through the use of digitalis extracts which block sodium-potassium ATPases.
sarcoplasmic reticulum [or SR; prompt on endoplasmic reticulum or ER] 