Biology 2382B Study Guide - Final Guide: Fibroblast Growth Factor Receptor, Monoclonal Antibody Therapy, Retrovirus
24 Apr 2018
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4 types -tight junctions -gap junctions -cell-cell adhesions -cell-ecm adhesions. A junction can be an adhesion but it the proteins that tell you what is going on. A hole in the membrane so the cytoplasm of one cell is linked to the cytoplasm of an adjoining cell. Protein called connexin - 6 connexin proteins come together on one plasma membrane and 6 connexin proteins come together on the adjoining plasma membrane and form a channel called a connexon. Links the cytoplasm of one cell to the cytoplasm of another cell. Different types of connexins are going to give different channel sizes. The channel formed (connexon) allows ions to go through. Stationary cells such as epithelial cells which are connected by gap junctions. Migrating cells do not have time to form gap junctions with adjacent cells. Epithelial cells have a certain amount of sodium and potassium that is relatively equal in concentration in all cells because it can diffuse across.
