These are called cilia.
cilia
Coughing
The excretory system removes unwanted particles in the body.
Ciliated columnar is a type of cell. Ciliated means that it has tiny hairlike projections on top of the cells that are usually used to capture unwanted pathogens and bacteria before they can do any damage to the body. Columnar is simply the shape of the cell. The cells are tall and skinny, shaped almost like a pillar from a building.
The cilia in the trachea move in a rhythmatic motion and the mucus produced by gland cells which traps foreign unwanted particles, like bacteria etc, is moved up to the pharynx where it is either coughed out or swallowed.
Nostril hair serves as a filter for the respiratory system. It helps trap dust, pollen, and other airborne particles, preventing them from entering the nasal passages and lungs. This helps to keep the air we breathe cleaner and protect the respiratory system from potential irritants or pathogens.
Ciliated Epithelial Cells have tiny hairs on them. These hairs sweep away any unwanted things, such as bacteria and dust which is trapped in mucus.
They both get rid of unwanted products of cell metabolism.
The cell membrane keeps out unwanted particles from the cell.
to breakdown nutrients our body uses to stay healthy then dispose of the unwanted particles.
Filtration can be used when you want to filter solid or unwanted particles out of a liquid such as water.
To remove unwanted microorganisms, dust particles and grease etc.....
I think the commercial advantage is that when settling, the particles settle to the bottom but filtering removes unwanted particles.. For example, people don't want to drink water with unhealthy particles in them, so they filter the water..