The essentials of healthA text-book of anatomy, physiology, hygiene, alcohol, and narcotics . mm^:%i%^ w Fig. 52. Transverse section of bone, not as highly magnified asFig. 53. Four Haversian canals (a) show, surrounded by lacunae andcanaliculi. Animal and Mineral Matter. The parts just described— the blood vessels, bone cells, marrow, nerves, and theframework of fibers — constitute the animal matter ofbone. But the body must have a strong support, somekind of a framework to which muscles can be attached,and in which the most delicate organs can be find, therefore, that some miner
The essentials of healthA text-book of anatomy, physiology, hygiene, alcohol, and narcotics . mm^:%i%^ w Fig. 52. Transverse section of bone, not as highly magnified asFig. 53. Four Haversian canals (a) show, surrounded by lacunae andcanaliculi. Animal and Mineral Matter. The parts just described— the blood vessels, bone cells, marrow, nerves, and theframework of fibers — constitute the animal matter ofbone. But the body must have a strong support, somekind of a framework to which muscles can be attached,and in which the most delicate organs can be find, therefore, that some mineral substance is added THE BONES. 161 to the soft and yielding animal matter; this makes thewhole tissue hard and unyielding. By remembering thai fire will destroy animal matterand thai aeids will dissolve mineral matter, some inter-est inu results may be obtained. For instance, if a fresh. Fig. 53. Longitudinal section of bone, highly magnified. Betweenthe two Haversian canals are a number of lacunae and canaliculi. bone be placed in the fire, and subjected to heat for aconsiderable time, all the animal matter can be burnedout. The shape of the bone will not be changed ; it willonly become lighter and whiter. After such treatmentit can be easily broken and pounded into a fine powder. The mineral matter consists largely of lime. This iseasily removed by soaking the bone in a weak acid fora few hours. The shape of the bone will not be changed ;it will only lose its hardness, and become easily bent inany direction. All the blood vessels and the bone cellsstill remain in the bone. 11 162 THE ESSENTIALS OF HEALTH. From these experiments we easily draw the conclu-sion that, if the bones do not contain the proper amountof mineral matter, they will bend, and will be unable tokeep their shape, and properly support the tissues aroundthem. If there is a deficiency in the amount of
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectphysiology, bookyear1
