What type of muscle cell lacks transverse tubules has a single nucleus and is under involuntary control?

The type of muscle cell that lacks transverse tubules, has a single nucleus, and is under involuntary control is smooth muscle. Smooth muscle cells are found in the walls of hollow organs, such as the intestines and blood vessels, and they facilitate involuntary movements like peristalsis and vasoconstriction. Unlike skeletal muscle, smooth muscle does not have a striated appearance and contracts slowly and rhythmically.