Template:X-Ray (Newsletter)
From Tempebrennan
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| colspan="2"| [[Image:Science1.jpg|thumb|100px|Bone cartilege]] | | colspan="2"| [[Image:Science1.jpg|thumb|100px|Bone cartilege]] | ||
...an article by Iain Barnwell | ...an article by Iain Barnwell | ||
- | As we grow older, our bones begin to harden. | + | As we grow older, our bones begin to harden. <br> |
- | This is known as ossification. A soft material called | + | This is known as ossification. A soft material called <br> |
- | hyaline cartilage forms the initial bone structure. | + | hyaline cartilage forms the initial bone structure. <br> |
- | Then half way down the shaft (diaphysis) of long bone | + | Then half way down the shaft (diaphysis) of long bone <br> |
- | cartilage, a calcified (formed by calcium) matrix | + | cartilage, a calcified (formed by calcium) matrix <br> |
- | begins to appear surrounded by the uncalcified matrix. | + | begins to appear surrounded by the uncalcified matrix. <br> |
- | This calcified matrix becomes the primary ossification centre. | + | This calcified matrix becomes the primary ossification centre. <br> |
- | Once ossified, the arteries and veins form inside a space | + | Once ossified, the arteries and veins form inside a space <br> |
- | called the medullary cavity. These supply the bone with its | + | called the medullary cavity. These supply the bone with its <br> |
- | required nutrients and transport white blood cells that | + | required nutrients and transport white blood cells that <br> |
- | originate in the bone marrow. At the epiphyses (the ends), | + | originate in the bone marrow. At the epiphyses (the ends), <br> |
- | secondary ossification centres form in the uncalcified matrices. | + | secondary ossification centres form in the uncalcified matrices. <br> |
- | The hyaline cartilage between the diaphysis and the epiphyses | + | The hyaline cartilage between the diaphysis and the epiphyses <br> |
- | becomes the epiphyseal plates at each end which allow for | + | becomes the epiphyseal plates at each end which allow for <br> |
- | bone extension throughout childhood and up to adulthood. | + | bone extension throughout childhood and up to adulthood. <br> |
- | At the same time, the articular cartilage forms and acts as | + | At the same time, the articular cartilage forms and acts as <br> |
- | a buffer for jointed bone movement. | + | a buffer for jointed bone movement.<br> |
|- | |- | ||
| colspan="2"| | | colspan="2"| |
Revision as of 01:03, 17 November 2007