Bone cells chapter 6

Canaliculi

A channel structure that aids in the removal of waste as well as communication

Osteons

Compact bone contains

bone remodeling

Process involving bone formation (osteoblasts) and destruction (osteoclasts)

Trabeculae

Structure prominent in sponges bone that provides extra strength and structure

90%

What percent of bone protein is collagen? (Osteoids are made up of collagen and calcium-binding proteins)

osteogenic cells

What type of bone cells: • are undifferentiated and develop into osteoblasts • is located in deep layers of the periosteum and in the marrow • mitotically active

Osteoclasts

What type of bone cells: • giant, multinucleate cells function in bone reabsorption (when active, cells are located in depressions called resorption bays) • as they break down bone, they send that calcium into the blood • similar to macrophages, partake in phagocytic behavior • found in bone surfaces, sites of old, injured, and unneeded bone • have ruffled borders that serve to increase surface area for enzyme degradation of bones

Osteocytes

What type of bone cells: • maintain mineral concentration of matrix • located entrapped in the matrix • mature bone cell • act as stress or stain sensors • mature bone cells in lacunae that no longer divide • communicate information to osteoblasts and osteoclasts so that bone remodeling can occur

Osteoblasts

What type of bone cells: • when osteoblasts get trapped within the calcified matrix, their structure and function changes and they become osteocytes (a mature bone cell) • bone formation (lay down new cells, like a cement truck [laying down and building bone] • secrete unmineralized bone matrix called osteoids (Osteoids are made up of collagen and calcium-binding proteins)

Bone resorption

the removal of minerals and collagen fibers from bone by osteoclasts