serves as the underlying support structure of the human body. It is made up of an intricate lattice of collagen fibers, and
mineral salts of calcium phosphate and calcium carbonate. Within this lattice, bone cells develop, creating the final structure
of the bone.
serve five purposes in the human body. The first is support, in which the bones anchor all the other internal structures,
and support the weight of the body.
is protection of soft tissues, like the brain, the spinal cord, and the heart and lungs.
is movement. In combination with skeletal muscles, tendons, and cartilage, the flexible structure of the skeleton allows for
the movement of the limbs, and the flexibility of the body as a whole.
function is storage. The bones store essential deposits of fat, as well as minerals like calcium and phosphorous. These stores
of calcium are important because they allow for the transmission of nerve signals, the contraction of muscles, and the clotting
function of bone is blood cell formation, which happens in the marrow cavities of certain bones.
two types of bone. The first, which is compact bone, is dense and smooth, and makes up most of the long bones in the arms
and legs. Spongy bone is made up of tiny plates of bone connected together over an open space. It makes up the short bones
found in the wrist, and flat bones, such as those that make up the ribs.
is made of tiny tubular canals, called osteons, in which a central canal runs up the length of the bone, carrying blood vessels
and nerves. Around the central canal are lamellae, concentric circles of bone cells, or osteocytes. The osteocytes are supplied
with the nutrients from the central canal through smaller canals called canaliculi, which run through the bony matrix.