有四种不同类型的组织。他们是;神经，上皮细胞，结缔组织和肌肉。神经组织的是，接收和发送电脉冲的神经元组成，这是它们的功能。有几种不同类型的上皮组织。首先出现的是简单的鳞状上皮组织。这是细胞的单个层，其是在血管的内衬，肺泡的衬里，和鲍曼在肾脏胶囊。这种组织的功能是从流体在组织和以单独的空气从流体在组织中，并过滤分离物质的血液从血液到形式尿液。下一类型的上皮组织的被复层鳞状上皮。这是一种两个或更多个层构成的组织和细胞倾向于是立方形。 This type of tissue is found in the epidermis of the skin and the linings of the mouth, pharynx, esophagus and anus. The function of this tissue is to protect and secrete. Transitional epithelium is the next type of tissue and it varies in shape from cuboidal to squamous. It is located in the linings of the urinary bladder and other hollow structures. Its function is to allow stretching to expand the organ that it is in. The next type is simple cuboidal epithelium. It is cuboidal cells that are in glands and parts of the kidney tubule and outer covering of ovaries. The function of this tissue type is secretion. Simple columnar epithelium is next and it is in the lining of the digestive tract and in ducts of many glands. Its function is to secrete and absorb from the stomach to the anus. Ciliated simple columnar epithelium is in the linings of the bronchi of the lungs, nasal cavity and oviducts. Its function is to secrete, absorb and propel fluids and particles. Then there is stratified columnar epithelium and it is in the linings of the epiglottis, pharynx, anus and male urethra. Its function is protection....