Parts of Nervous System. Nervous System: Nervous system is the chief controlling and coordinating system of the body. It controls and regulates all activities of the body, whether voluntary or involuntary, and adjusts the individual (organism) to the given surroundings.
Compared to skeletal muscle, smooth-muscle cells are small. They are spindle-shaped, about 50 to 200 microns long and only 2 to 10 microns in diameter. They have no striations or sarcomeres. Instead, they have bundles of thin and thick filaments (as opposed to well-developed bands) that correspond to myofibrils.
Smooth muscle, skeletal muscle, and striated muscle are all muscular tissues. They have differences however, smooth muscle is involuntary and is usually found in the visceral organs (these are stomach, the intestines and the like) of the body; a striated muscle can either be skeletal or cardiac, they are striated because of the presence of certain proteins that constitute them.