MAIN FEATURES OF ANIMAL TISSUES
| Tissue | Morphological features |
| Epithelial | The epithelial cells stay very close together, and a very small amount of extracellular matrix existe between them |
| Connective | Cells separated by large amounts of extracellular matrix |
| Muscular | Elongated cells with little extracellular material between them |
| Nervous | Most cells have extensions that form complex networks with other nervous cells and with cells of other tissues. Very little extracellular matrix |
| Tissue | Some of their main functions |
| Epithelial | Coating of the external surface and internal surfaces of the body; secretion |
| Connective | Support of the whole body, its tissues and organs, filling of spaces, nourishment of cells of other tissues, bodily defense, secretion |
| Muscular | The contraction of its cells generates movement, secretion |
| Nervous | Generation, integration and transmission of nervous impulses, secretion |