18. Intecelluar Junctions Flashcards
What do all cell junctions consist of? What do they provide with?
What is a anchoring cell divided into? What do they act like? What kind of proteins does the it’s process consist of? What’s the specialised adhesion protein called? What’s does the cadherins attach to? What are some examples of anchoring junctions?
All cell junctions consist of multiprotein complexes. They provide communication and exchange between cells.
Anchoring junctions are divided into the subcategories Desmond ones and hemidesmosomes. They act like spot welds between epithelial cells. It involves complex proteins. The specialised adhesion protein involved with anchoring junctions is called cadherins. The cadherins attach to the cytoplasmic plaque and connects to the filaments witch makes a junction between two cells. They are found in cells that involve a lot of stretching like cardiac muscle and the epidermis.
What’s a barrier junction? What does it do? How do they hold together tightly? How are claudins arranged? What’s it’s purpose? Whats a example of a tight junction?
What’s a communicating junctions? What does it create? What does I allow transport for? How are channels formed? What is the channel called? Where is gap junctions important? What is it similar to in plants?
A barrier junction is a tight junction. It creates a water tight seal between adjacent cells. The cells are held tight together by proteins called Claudins. Claudins are arranged into strands that form a branching network. It’s purpose is to keep liquids from escaping the cell. One example of a tight junction is the bladder which has tight junctions to prevent the urine from leaking.
A communicating cell is a gap junction. It creates channels between cells. It allows transportation of ions,water and other substances. The channels are formed by 6 connexins. The 6 connexins form a channel called connexon. It’s important In cardiac muscle cells. It’s very similar to plasmodeaamta which are in plant cells.
