An Antibody Test on Smooth Muscle Reveals Fewer Dense Bodies

An antibody test on smooth muscle reveals fewer dense bodies and intermediate filaments in a patient with a colon disorder.What is the purpose of these structures?

A) can rapidly develop action potentials in smooth muscle cells
B) shallow invaginations of cell membrane
C) maintain relatively constant tension in smooth muscle for a period of time
D) part of the intracellular cytoskeleton
E) act as enzymes that remove phosphate from myosin