High resolution

Module 7: Figure smooth muscle cell structure

Structure of a typical smooth muscle cell.

One end of the actin filament is tethered to a dense body, which is either attached to the plasma membrane or lies free within the cytoplasm. The dense bodies, which provide the anchorage points between the contractile filaments and the plasma membrane, contain α-actinin and vinculin and appear to be analogous to the Z lines in skeletal muscle.