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mineralized salts and collagen

two components in bone are responsible for the hardness and pliability

volkmann's canals

carry blood vessels through the center of compact bone lamellae

osteocytes

responsible for maintaining daily bone metabolim

endochondral ossification

carilaginous model is gradually replaced by bone tissue

spongey bone is located

in the epiphysis

trabeulae

not part of an osteon

diaphysis

shaft

epiphyses

rounded ends

metaphysis

epiphyseal plate (connects diaphysis to epiphyses)

medullary cavity

middle cavity filled with marrow

cortex

outer compact bone

periosteum

dense connective tissue outer lining of bone

endosteum

dense connective tissue inner lining of bone and medullary cavity of long bones

articular cartilage

hyaline cartilage covering epiphyses

compact bone

composed of osteons near the surface of the bone

canaliculi

tiny canals in the matrix through which osteocytes connect to each other

lacunae

space between lamellae containing osteocytes.

lamellae

rings of hard, calcified matrix around canals

osteons

(haversian systems) microscopic functional anatomic units of compact bone

osteogenic

produces osteoblasts. unspecialized stem cells found in the periosteum, endosteum and bone canals that are capable of cell division

osteoblasts

bone building cells. synthesize and secrete collagen/organic components to build new bone matrix; initiate calcification

osteocytes

mature bone cells. maintain daily cellular activities of bone such as nutrient and waste exchange with the blood. found in lacunae.

osteoclasts

function in bone resorption. destroy the matrix. found in the endosteum. help regulate blood calcium levels

tensile strength

resistance to being stretched or torn apart; provided by collagen fibers/organic molecules

bone

Ca2 reservoir

kidneys

filter and reabsorb Ca2

GI tract

few absorption of Ca2

Vitamin D

absorprtion of Ca2 at GI tract

parathyroid and calcitonin

Ca2 regulators

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