Smooth muscle is an involuntary non-striated muscle. It is divided into two sub-groups; the single-unit (unitary) and multiunit smooth muscle. Within single-unit smooth muscle tissues, the autonomic nervous system innervates a single cell within a sheet or bundle and the action potential is propagated by gap junctions to neighboring cells such that the whole bundle or sheet contracts as a syncytium (i.e., a multinucleate mass of cytoplasm that is not separated into cells). Multiunit smooth muscle tissues innervate individual cells; as such, they allow for fine control and gradual responses, much like motor unit recruitment in skeletal muscle.
well smooth muscle is involuntary. you don't have control over it. but it is always tight, and likes to stay tight and open slightly. when it expands it contracts, to shrink back to its normal state. our GI tract is made of smooth muscle mainly. smooth muscle is located in walls of hollow organs. the structure i guess would be, spindle-shaped with central nuclei, no striations, cells arranged closely to form sheets.
this is a structure of smooth muscle
you're welcome hope i helped :)
Thanks for your help =)