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.
The muscles are of three major types known as smooth, skeletal, and cardiac. Out of those three, skeletal muscles are mostly known, cardiac muscles are also known up to a fair extent, but the most common type of smooth are not well known. It would be interesting to explore the characteristics and differences between mostly known and mostly unknown types of muscles.