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.
Main Difference â Flagella vs Pili. Flagella and pili are appendages found in the invertebrate cell body. Both flagella and pili are made up of proteins. Flagella are whip-like and pili are hair-like. Flagella are extended from the interior cell body while pili extend from the cell surface. pili are mostly found in bacteria.