Each tissue type can be easily recognized by distinct features that can be seen using a compound microscope. The study of tissues is called histology. Special cell membrane proteins form these contacts. Tight junctions between adjacent cells make tissues leak proof. Adhering junctions hold adjacent cells together.
Gap junctions permit the cytoplasm of adjacent cells to communicate.
An extracellular matrix surrounds almost all cells in an animal's body. Cell adhesion molecules also bind cells. Successful multicellularity depends on membrane specializations. Sections 33.1, 33.2, 33.3, and 33.4 should be read carefully. Pay attention to Figures 33.2, 33.3, and 33.5.