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(一)人体的构成人体的构造虽然复杂,但是由同一物体构成的,这种物体叫做「细胞」,人体的细胞是很小很小的,非用显微镜看不清楚,总和起来一个人体上的细胞不知道要有多少万万。每一个细胞都是有生命的,人体整个的生命也就是它们的集体表现,所以说细胞是构成人体的单位。许多同样的细胞集合起来构成了组织,几种不同的组织集合起来构成了一个器官,(如胃’肠,皮肤……等)各种功用不同的器官集合起合构成了一个系统,(如泌
(A) the composition of the human body Although the structure of the human body is complex, but by the same object, this object is called “cells”, the human body cells are small and small, not to use the microscope can not see clearly, sum up a human body Cells do not know how many millions. Every cell is alive, and the entire life of the human body is their collective performance. Therefore, cells are the units that make up the human body. Many of the same cells are grouped together to form a tissue. Several different tissues assemble to form an organ (such as stomach, intestine, skin, etc.). Various organs with different functions form a system