Mature bone cells, live in lacunae, between layer (lamellae) of matrix, does not divide, Function: Maintain proteins & minerals content of matrix, help repair damaged bone
Immature bone cells that screte matrix compound (osteogenesis), osteoid matrix produced but not yet calcified to form bone, surround by bone become osteocytes.
Assist in fracture repair, located in endosteum, the inner, cellular layer of periosteum Mesenchymal stem cell (partially differentiated squamous), divide to become osteoblasts
Secrete acids, protein, and digesting enzymes, giant multinucleate cells, dissolve bone matrix and released stored minerals(osteolysis), are derived from cells that produce macrophages, found in small depression on the endosteal surfaces
Osteocytes are arranged in concentric lamellae, around the central canal containing blood vessels.
Perpendicular to the central canal, carry blood vessels into bone and marrow.
Does not have osteons, open networks of trabeculae, red bone marrow is found between trabeculae of spongy & blood vessels, supplies nutrients to osteocytes, trabeculae has no blood vessels, yellow bone marrow stored fats.
Process of depositing calcium salts, occurs during bone ossifications and other tissues
Ossifies bone that originate as hyline cartilage
Effects of Exercise on bone
Minerals recycling allow bone to adapt to stress, heavily stress bones becomes thicken & stronger, a lack of exercis can cause weak bone
Skeleton calcium reserve, bones store calcium & other minerals, calcium is the most adundant, calcium ion vital to membranes, neuron, muscle cells, especially the heart.
Calcium ions in body fluid must be closely regulated, homeostasis is maintained by calcitonin & parathyroid hormone which control storage