Purpose of the experiment: the purpose should be clear, in theory, to verify the theorems, formulas, algorithms, and to enable the experimenter to obtain a deep and systematic understanding, in practice, to master the use of the experimental equipment skills and techniques and debugging methods of the program. Generally need to specify whether it is a verification type experiment or design type experiment, innovative experiment or comprehensive experiment.
Experimental equipment (environment) and requirements: in the experiments need to be used in the experimental materials, drugs and environmental requirements.
Experimental principles: the main principles related to the experiment.
Experiment content: this is the experimental report is extremely important content. To seize the focus, can be considered from both theoretical and practical aspects. This part should be written based on what kind of principles, laws algorithms, or operational methods for the experiment. Detailed theoretical calculation process.
Epithelial cells
Show obvious polarity, they face the body surface or luminal organ luminal surface, called the free surface; with its opposite side toward the deep connective tissue, called the basal surface. The free and basal surfaces are distinctly different in structure and function. Epithelium located in different parts of the body and different organs, cell free surface often has a different structure to adapt to their respective functions.
The epithelium is rich in nerve endings, but there are generally no blood vessels, and the required nutrients are provided by blood vessels in the connective tissue, and the nutrients penetrate through the basement membrane into the interstitial space of the epithelial cells.?
Above reference; Baidu Encyclopedia - Epithelial Tissue