Lab manual may also be of use. The dermis contains the support and nourishment for the epidermis and its structures. No blood vessels, so generally slow healing. Lighter than bone.
Endochrondal bone forms the long bones from cartilaginous precursors.
The end of the long bone, the epiphysis, keeps growing until adulthood. Briefly, muscles work by contraction . The striations represent light and dark patterns of myofibrils, or the bundles of contractile proteins within skeletal muscle cells. Actin and myosin within the myofibrils actually create the light and dark bands, with the light bands containing only the thin actin and the dark bands containing both actin and the thicker-fibers of myosin. The myofibril works by a unit called the sarcomere.