these results indicate that 1 ) microfilaments are localized mainly underneath the luminal plasma membrane and act as an obstacle to exocytosis when cells are at the resting phase and 2 ) at the secretory phase microfilaments allow exocytosis by disorganizing their barrier system and then , by encircling the discharged secretory granule membranes , provide forces for the extrusion of secretory products through the action of the acto-myosin contractile system .
C0007634
cells
C1511498
contractile system