骨密度T值0.3是什么意思?

解题思路：此题考查骨膜的结构和作用．骨膜内有血管、神经和成骨细胞．

骨的基本结构包括骨膜、骨质和骨髓三部分组成．其中骨膜是紧密贴附在骨表面的一层致密结蹄组织膜，骨膜内含有神经和血管分布，起营养骨质的作用，神经还有感觉的作用；骨膜内还有成骨细胞，成骨细胞可以产生新的骨质，与骨的长粗和骨折后的修复愈合有关．因此与骨的长粗和骨折后的修复有关的成骨细胞，位于鼓膜内．
故选：A

点评：
本题考点： 骨的基本结构和功能．

考点点评： 掌握握骨的结构与功能相适应的特点是解答此类题目的关键．

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About the Principle of Glucosamine Used in Health Foods (For reference only)
Glucosamine is a functional product for increasing bone mineral density,includes the hydrochloride of D-aminosugar and the sulfate of D-aminosugar.
There are two precautions:
1)Since in the 27 kinds of functions specified in the Health Food Code the function of protecting bone joint is excluded,the health foods containing glucosamine has to apply for license starting from the function of increasing
bone mineral density.Now there have been a few health foods containing glucosamine being approved.
2)Dosage:General daily dosage is 500 mg,being 1/3 of the dosage as drug.At present the dosage of glucosamine as drug is 15000 mg/day.