Peritrich: hairy, relentless, and brilliantly simple.
When the environment becomes unpleasant (too acidic, for example), the flagella suddenly reverse direction. The neat bundle explodes apart, each flagellum pushing in a different direction. The cell stops dead and in place—a chaotic somersault. Then, a moment later, the flagella rebundle in a new random orientation, and the cell runs off in a fresh direction. peritrik
Here’s where it gets clever. For a long time, scientists thought all those flagella spun independently, creating chaotic, drunken swimming. But nature loves efficiency. When a peritrich bacterium wants to go somewhere (say, toward a drop of glucose), all its flagella bundle together behind the cell, spinning as one coordinated rotor. The cell shoots forward like a torpedo. This smooth, directed motion is called a The Tumble: A Genius Reset Button But how does a tiny cell with no brain decide where to go? It doesn’t. It uses a brilliant random search strategy. Peritrich: hairy, relentless, and brilliantly simple