Tight Junction
Tight junctions, or zonula occludens, are the closely associated areas of two cells whose membranes join together forming a virtually impermeable barrier to fluid. It is a type of junctional complex present only in vertebrates. The corresponding junctions that occur in invertebrates are septate junctions.
Read more about Tight Junction: Structure, Functions, Classification
Famous quotes containing the words tight and/or junction:
“A really tight friendship is when you start to really care about the person. If he gets sick, you kind of start worrying about him—or if he gets hit by a car. An everyday friend, you say, I know that kid, he’s all right, and you don’t really think much of him. But a close friend you worry about more than yourself. Well, maybe not more, but about the same.”
—Anonymous Fifteen-Year-Old Boy. As quoted in Children’s Friendships by Zick Rubin, ch. 3 (1980)
“In order to get to East Russet you take the Vermont Central as far as Twitchell’s Falls and change there for Torpid River Junction, where a spur line takes you right into Gormley. At Gormley you are met by a buckboard which takes you back to Torpid River Junction again.”
—Robert Benchley (1889–1945)