Unit 6 Skeletal system: Bones and Joints
|Hematopoeisis|| Blood cell formation.|
Not a function of bone tissue but a function of a whole bone.
Occurs in the hollow space between bone tissue.
|Calcium Reservoir|| Bone Function.|
Stores calcium when too much in bloodstream, releases it when not enough in bloodstream. Controlled by hormone/endocrine system
|Compact Bone|| (dense bone) |
Dense bone on the outer surface that forms a sturdy protective layer.
|Spongy Bone|| (cancellous bone)|
forms trebeculae on the interior of the bone
|"Physis"||"growth plate" or site of growth at the ends of long bones.|
|Epiphysis|| ("epi-"=upon, "physis"=growth plate|
expanded area at the end of the bone, above the growth plate.
|Epiphyseal Plate||growth plate|
|Metaphysis||where diaphysis and epiphysis meet|
|Diaphysis||the shaft or long portion of the bone|
|Hydroxyapatite|| Inorganic portion of the Bone Matrix|
Calcium and Phosphorus in crystal form.
Resists Compressive Forces
|Osteoid|| Organic portion of the Bone Matrix|
Mostly (90%) Type 1 Collagen
Resist Tensile Forces
|Articular Cartilage|| Hyaline Cartilage that covers the epiphysis where one bone forms a joint w/ another.|
Reduces friction and absorbs shock
|Osteoprogenitor Cells|| -Mesenchymal stem cell, differentiates into an osteoblast|
-maintains population of bone cells (osteoblast cannot divide)
-active during bone growth and are reactivated during fracture repair
|Osteoblasts|| -"blast"=to produce|
-produce and secrete components of bone matrix(osteoid)
-produce TNAP--essential for mineralization (hydroxyapatite)
|Osteocytes|| -a mature osteoblast that as completely surrounded itself with bone matrix|
-reside in lacunae
-cytoplasmic process housed in little tunnels, Canaliculi