正常人体的组织结构及其功能（The structure and function of normal human body）.docVIP

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正常人体的组织结构及其功能（The structure and function of normal human body）.doc

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正常人体的组织结构及其功能（The structure and function of normal human body）

正常人体的组织结构及其功能（The structure and function of normal human body） The second chapter is about the structure and function of normal human body 1. Epithelial tissue defined by large numbers of closely arranged, well structured epithelial cells and a very small amount of extracellular matrix. The general characteristics of epithelial tissue: large amounts of cells and a small amount of extracellular matrix; polarity; no blood vessels; abundant nerve endings. The distribution and function of epithelial tissue: 1, distribution: distributed in the body surface, tube, cavity, bladder organs, the surface of the cavity, the surface of certain organs, glands and so on. 2: function: protection, absorption, secretion, excretion, sensory and other functions. Epithelial tissue classification: covering epithelium, glandular epithelium and sensory epithelium 2. The classification of covering epithelium: single layer squamous epithelium surface: irregular or polygonal cells, oval nucleus, located in the middle of cell, jagged edge of cell border, mosaic each other. Vertical cell: flat and thin, less quality, protruding into the nuclear. Endothelium: a single layer of squamous epithelium distributed in the heart, blood vessels, and lymphatics. Mesothelial: a single layer of squamous epithelium distributed in the pleura, peritoneum, and the heart envelope. The main function is to keep the organs surface smooth, conducive to exchange of substances and liquid flow, and facilitate internal organ activities. Single cuboidal epithelium surface: each cell is hexagonal or polygonal; vertical section: cubic shape, nuclear ellipse, located in the center. Located in the thyroid and renal tubules, it has the function of absorption and secretion. Single columnar columnar epithelium surface: polygonal vertical view: the cells are columnar, oval, and near the base of cells. The distribution in the stomach, gall bladder and uterus etc. the functions of absorption and secretion of the pseudostratified c