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Mucus traps solid particles that have made it into the trachea so that the ciliated cells on the wall of the trachea can use their periodic beating motion to gradually move the trapped particles up for clearance.
some cells in this lining secrete a sticky liquid called mucus, which traps particles of dirt or bacteria that are breathed in. Other cells are covered with timy hair-like structures called cilia. It sweeps the mucus and trapped particles out toward the mouth.
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.
Chlorophyll traps the light energy from the sun
The Pinna which is the external ear
mucus
The gravity traps everythings on a planet.
A sticky secretion on the scales of seed cones traps pollen grains. Structure is produced by a pollen grain that lands near an ovule is pollen tubes.
Sand traps large particles - such as paper, stones and other foreign objects.
nose hairs
because of the sand particles
snot
Airway motile cilia move mucus out of the lungs, and mucus traps inhaled particulate, smoke and dust.
Mucus helps in trapping pathogenic microorganisms and dust particles and prevent them from entering inside the lungs, second it keep respiratory tract moist so that friction is reduced. Another function of Mucus is to regulate the temprature of the inhaled air.
Cilia acts like a filter. It traps dirt particles that we inhale and moves these particles out of the body.
It traps carbon particles from the exhaust stream of a diesel engine, and, during regeneration, serves as a combustion chamber to incinerate those particles.
The oil traps small dirt particles from entering engine.