The microfilament system is a network of filaments 6 nanometers (nm) in diameter that are important for anchoring plasma membrane proteins, for producing cell movement, and for cell division. The base filament is composed of a protein called actin that is 42 kilodaltons (kd) in weight.
It is divided into two subgroups; the single-unit (unitary) and multiunit smooth muscle. Within single-unit cells, the whole bundle or sheet contracts as a syncytium (i.e. a multinucleate mass of cytoplasm that is not separated into cells).mooth muscle is fundamentally different from skeletal muscle and cardiac muscle in terms of structure, function, regulation of contraction, and excitation-contraction coupling. Smooth muscle cells known as myocytes, have a fusiform shape and, like striated muscle, can tense and relax.
Answers. Best Answer: this is a good cartoon for smooth muscle. in general, it is spindle shaped with a central nucleus. it is cross linking spindle fibers for contraction. it is NOT striated like skeletal and cardiac muscles.Source(s): http://www.udel.edu/biology/Wags/histopa...nswers. Best Answer: this is a good cartoon for smooth muscle. in general, it is spindle shaped with a central nucleus. it is cross linking spindle fibers for contraction. it is NOT striated like skeletal and cardiac muscles. Source(s): http://www.udel.edu/biology/Wags/histopa...