These are tiny "fingers" which move mucous. The mucous is sticky and traps dust, pollen and other particles. Together the cilia move the mucous out of the lungs. If this didn't happen these things trapped in the mucous would cause damage to the lungs and a person would have breathing difficulties over time.
The combination of cilia and mucous helps to filter out solid particles from the air.
A tube containing cilia is called a trachea. The trachea is part of the respiratory system and it helps to move mucus and debris away from the lungs by the beating action of the cilia.
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The trachea is lined with cilia, which are tiny hair-like structures that beat in a coordinated manner to sweep away particles and dust trapped in mucus towards the throat where they can be expelled by coughing or swallowing.
Mucous membranes and cilia in the trachea trap and eliminate particulate matter from inhaled air. The membranes also warm and moisten incoming air.
The tube is known as the trachea, or windpipe. It serves as a passageway for air to travel in and out of the lungs. The rings of cartilage help keep the trachea open, while the cilia and mucous membrane function to trap and remove any foreign particles or debris from the air before it reaches the lungs.
The hairs on the trachea are called Cilia and are for helping lifting up the mucus up the throat. Smoking can kill these hairs and they will have to swallow the mucus.=D
Cilia.
In the lining of the trachea, bronchi, and bronchioles.
For a human who has smoked and destroyed the cilia by coating the inner wall of the trachea with tar, the mucus that is secreted will have no mechanism to bring it up the trachea to be swallowed except for the 'smoker's hack', a chronic cough that brings up the phlegm from the lungs. Those cilia do not regenerate so, the person will have the 'smoker's hack' for the rest of his life.
The cilia are always moving, bacteria or particles of dust trapped in the mucus are moved away by cilia. The cilia waft the mucus containing bacteria and dust up to the back of the throat, so that it doesn't block up the trachea and thus keeps it clean.
The cilia in the trachea is same as the cilia in the nose. They both clean the air before entering our lungs. If there's no cilia, then the lungs would most likely have problems, if not dealt with quickly. Noticed how when you breathe through your mouth more often you cough more. This is because of the cilia cleaning the air and also forcing the dirty particles out of the respiratory system.