The muscular system is the biological system of animals that allows them to move internally and externally. The muscular system in vertebrates consists of three different types of muscles: cardiac[?], skeletal[?] and smooth[?]. 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 all muscles is controlled through the nervous system.
... is spread out with 13.8% under the age of 18, 34.0% from 18 to 24, 17.6% from 25 to 44, 20.5% from 45 to 64, and 14.1% who are 65 years of age or older. The median ...