The Skeletal System

I learned in the skeletal system that the bone cells osteocytes  maintain matrix within the lucunae.Osteoblasts deposit matrix , and when they get caught  become osteocytes. Osteoblasts come from osteochondral progenitor cells  , which comes from mesenchymal cells  all cells resposible for making connective tissue. Osteoclasts break down nbone , secrete water , make hydrochloric acid , breaks down collagen fibers . Precursor cells are monocytes ,which phagocyte , andand become become" big eaters" nacrophages. Cells that produce cartilage are chondoblasts ,and are trapped inside and become chondrocytes .The job of the chondrocytes is to maintain cartilage . In the bone matrix the inorganic material consists primarily of hydroxyapatite . The organic molecules has two things C02 ,and H2 .Collagen is a lipid , a big molecule, subunit protein anino acid is 20.Collagen -amino acids are all organic.The function of the skeletal system is to support , to hold the body up ,prtection of all major organs , movement , and storage . I learned there are two types of cartilage ; hyaline  , and fibrocartilage . Fibrocartililage is found in the intervebral discs ,sympyhsis ,balland socket / glenoid cavity . The hyaline cartilage can be found in in the synovial joints , slick surfaces , epephyses paltes , long bones ,synchondroses ,bends ,ribs to sternum . We grow cartilage byinterstitial and appositional growth .Interstitial , catilage replicates, , appositional  , chondroblasts add new cartilage to the outside of the cartilage .I learned the two tyoes of bone growth , intramembranous ossification , and endochondral ossification . Intramembranous growth takes palce within the connnective tissue membrane , while the endochondral ossification takes palcein the cartialage .Both methods produce woven bone , which is then remodeled .