The purpose of mucus present inside the respiratory system is to trap foreign particles from the air before they reach the lung.
Further Explanation:
Lungs have a powerful defense against respiratory system infections. The nasal cavity is lined with hairs to expel the trapped microbes by a sneeze. During respiration, the ingested air becomes humidified and warm. Such conditions allow the secretion and proper functioning of the mucus formed in the respiratory system. This prevents the delicate respiratory tissues from damage. Turbulence is created when the air enters the lungs due to the expansion of the diaphragm. Thus, the flow of turbulent air makes it difficult for these foreign particles to remain in the lungs.
The bronchioles consist of the cilia (contains goblet cells that secrete mucus) that helps in the up and down movement of the mucus in the conducting airways. The mucus, along with the entrapped foreign particles, can be expelled by coughing and swallowing. The alveolar macrophages help to phagocytize the alien microbes.
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Answer Details:
Grade: High School
Subject: Health
Chapter: Immunology
Keywords:
Lungs, secretion, foreign particles, mucus, cilia, difficult, trapped microbes, sneeze, alveolar macrophages, microbes, coughing, swallowing.