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人的个子高矮完全取决于骨骼,尤其是股骨和胫骨的长度。人体上的骨骼左右对称,排列有序,为人提供着五项功能。一是使身体有一定的形状;二是为筋肉提供依附的地方;三是保护心脏、脑、肺等重要器官;四是储存钙;五是造血。哪一项功能出了问题都会失去健康,甚至生命。一个人刚出生时共有350块骨头,由于一些骨头在生长发育过程中互相融合了,所以成年时只剩下206块骨头。人的每块骨头都是活的,都在不断新陈代谢。它的成分是25%的水,45%的矿物质,主要是钙,其余是细
The height of a person depends entirely on the length of the bones, especially the femur and tibia. Symmetrical human bones, arranged in an orderly manner, providing five functions. First, the body has a certain shape; Second, to provide attachment to the muscles; Third, to protect the heart, brain, lung and other vital organs; Fourth, storage of calcium; Fifth, hematopoiesis. Which one function out of the problem will lose health and even life. When a person has 350 bones at birth, only 206 bones remain in adulthood as some bones fuse with each other during their growth and development. Every human bones are alive, are constantly metabolism. Its composition is 25% water, 45% minerals, mainly calcium, the rest is fine