Welcome To Aaryan Super Knowledge Animal Tissues On the basis of the structure of cells and their function, animal tissues are classified into four major types: Epithelial Tissue Muscular Tissue Nervous Tissue Connective Tissue Epithelial Tissue: The covering or protective tissues in the animal body are animal tissues. The cells of this tissue are tightly packed and it forms continuous sheet. Indeed cells of epithelium contain very little or no intercellular matrix. The skin and lining of buccal cavity, blood vessels, alveoli of lungs and kidney tubules are made of epithelial tissue. Epithelial cells lie on a delicate non-cellular basement membrane which contains a special form of matrix protein, called collagen. Functions: Epithelial cells protect the underlying cells from mechanical and chemical injuries and bacterial or viral infection. It covers most organs and cavities within the body. It also forms a barrier to keep different body system separate. Epithe
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