This preview shows page 1. Sign up to view the full content.
Unformatted text preview: the cytoskeleton. Many epithelial cells must adhere to adjacent membranes to prevent free passage or free movement, and to not break apart under stress. Desmosome filaments are composed of specialized glycoproteins. Intermediate filaments of keratin in the desmosomes help strengthen the junction. Actin microfilaments can also attach to desmosomes, but have less strength. Gap Junctions (Communicating Junctions) Gap junctions are protein channels between adjacent cells that permit the transfer of small molecules between the cells. They are common in brain cells, forming the synapse, in many glands, and in cells in the heart muscle that coordinate contraction for heartbeat. The plant plasmodesmata, discussed previously, are a plant communicating junction....
View Full Document
This note was uploaded on 12/29/2011 for the course BIO 151 taught by Professor Edwards during the Spring '10 term at SUNY Stony Brook.
- Spring '10