pellicle
Also known as the film, usually refers to protozoa, such as green Euglena (euglena viridis), large paramecium (parameciun caudatum), etc., have a flexible surface coating, with a diagonal surface film, is actually a plasma membrane.
Body surface is a thin layer of protozoan plasma membrane, making the body to maintain a certain shape. Surface membrane of flexible and can adapt to changes in body shape.
Before the advent of electron microscopy that the surface membrane is secreted by the cuticle formation of protoplasm, the latter by electron microscopy, surface membrane is still known as one-third of the plasma membrane or plasma membrane. Such as green Euglena surface membrane is composed of many spiral stripes join together. Stripes each side of the surface membrane of the ditch with inward, outward of the ridge with the other side. A striped trench adjacent to its associated ridge stripes (like joints). Groove and ridge is an important structure of the surface membrane stripes. Euglena life, surface membrane stripes move relative to each other, may be due to crest in the ditch sliding results. Parasite surface membrane to maintain a certain shape, but also for shrinkage movement. Surface membrane and the number of stripes, patterns and so on the structure of the classification of animals play an important role, is often one of the characteristics of species. |