The muscular system is the biological system of animals (including humans) that allows them to move internally and externally.
The muscular system in vertebrates consists of three different types of muscles:
Cardiac muscle is a striated muscle that makes up the heart. It is the only type of muscle consisting of branching fibers.
Skeletal muscle consists of voluntary muscles attached to the frame of the skeletal system enabling bodily movement.
Smooth muscle is the involuntary muscle that enables the movement of internal
organs. Movement of most muscles is controlled through the nervous
system, although some muscles (such as cardiac muscle) can be completely autonomous.
There are about 70,000 muscles in the human body.