If pressure from outside the lungs causes atelectasis, your doctor will treat the cause of the pressure. For example, if the cause is a tumor or fluid buildup, your doctor will remove the tumor or fluid. This will allow your lung to fully expand. Atelectasis Caused by a Blockage
Pilus. Definition. noun, plural: pili. (microbiology) Short, filamentous projection on a bacterial cell, used not for motility but for adhering to other bacterial cell (especially for mating) or to animal cells. Supplement. Bacterial pili are involved in cell adhesion.
Pili are the fine hair like projections present on the bacterial cell surface. Only one or few pili are present on the cell surface. They are genetically determined, and are u â¦ sed for attachment in case of pathogenic bacteria.   These are the 7 main structures of a prokaryotic cell with descriptions and functions:       1) Ribosomes-A small Organelle constructed in the nucle â¦ oid, consisting of two subunits and functions as the site of protein synthesis in the cytoplasm.