dihydropyridine receptors, foot proteins, Ca2+, dihydropyridine receptors, Ca2+
voltage sensitive proteins called ___ __ are in the cell membrane of the T-tubules. These receptors are connected to __ __, which are in the cell membrane of the terminal cisterna. Foot proteins are __ channels. When the T-tubules are depolarized, the __ __ change shape, which in turn stimulates the abutting foot proteins to open up, allowing __ to flow from the terminal cisterna into the cytosol.