What is the main role of the nasal cavity in respiration?

The main role of the nasal cavity in respiration is to filter and humidify the air. The nasal cavity is equipped with mucous membranes and tiny hair-like structures called cilia, which work together to trap dust, allergens, and pathogens. This filtration process ensures that the air reaching the lungs is clean and free of harmful particles. Additionally, the nasal cavity adds moisture to the air, which is important for maintaining the health of the respiratory tract lining and optimizing gas exchange in the lungs.

The design and function of the nasal cavity play a critical role in preparing inhaled air for the lungs, promoting efficient respiration and overall respiratory health.