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Bone cells, which are found within the bone tissue, are responsible for the make-up of the skeleton of vertebrates. There are different types of bone tissue in a bone that are made up of different bone cells: there is the compact tissue which is the hard outer part of the bone, the cancellous tissue which is all the spongy tissue inside of the compact tissue, and the subchondral tissue which is the smooth tissue at the end of each bone.〔"All About Bone." All About Bone. Ohio State University, n.d. Web. 19 Mar. 2013.〕 Bone cells all work together inside of the bones to help keep up the skeletal system. The bone cells do many things for the skeletal system such as the development of new bones, the maintenance of bones, and the regulation of minerals in the body. ==Types== There are four main categories of bone cells which include: # osteoclasts, which destroy bones # osteoblasts, which build bones # osteocytes, which hold the bone together # lining cells, which protect the bone〔Oursler, Merry J., and Teresita Bellido Bellido. "Bone Cells." ASBMR Educational Materials. ASBMR Educational Materials, 12 Sept. 2003. Web. 19 March 2013.〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Bone cell」の詳細全文を読む スポンサード リンク
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