In the smooth-muscle cells from guinea-pig ileum a highly developed sarcoplasmic reticulum has been observed immediately underneath the plasma membrane in close relationship to the caveolae intracellulares. It is suggested that sarcoplasmic reticulum in smooth muscle may play a similar role as in skeletal muscle, constituting the main intracellular store for calcium.
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Giorgio Gabella (1971) studied this question.
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