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How does the body defend itself against the harmful effects of airborne dust?
Wiki User
∙ 15y ago
The body's defense against dust etc starts in the nose. The main function of nose hair is to protect against airborne particles. These hairs are coated in sticky mucous which collect dust. The nose also warms and moistens the aiir we inhale.
Dust that gets past the nose has to pass the pharynx, larynx, enter the trachea before it can get to the lungs. However this part of the respiratory tract is also lined with mucous producing cells. The trachea is lined with hairlike cells called cilia, which waft the mucous, and any particles stuck to it upwards along the "mucociliary escalator" back up to the larynx wehere it is either coughed up or swallowed.
The cough reflex is another important mechanism to protect against foreign particles. Nerve endings in the larynx, trachea and bronchi are sensitive to irriatation, this sends impulses along the vagus nerve to the brains' respiratory centre in the brain stem, which causes the cough.
Waugh A and Grant A (2006) Ross and Wilson Anatomy and Physiology in Health and Illness, Edinburgh, Churchill Livingstone
Wiki User
∙ 15y ago
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