SUBCELLULAR LOCALIZATION OF SODIUM AND POTASSIUM IONS IN SKELETAL MUSCLE

Abstract

In the skeletal muscle, the subcellular distribution of sodium and potassium ions was similar to that in the cardiac muscle, using the histochemical technique.
The precipitates from the sodium ion were observed mainly in the intercellular space, on the I band of the myofibrillar region and inside the terminal cisternae and nucleus. The precipitates were also observed scatteringly in the mitochondria and the A band of the myofibrillar region. No precipitate was observed inside the transverse tubule.
The precipitates from the potassium ion were found on the intracellular side of the sarcolemma and of the transverse tubule. It was also observed scatteringly in the mitochondria and on the myofibrils.