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It filters, humidifies and warms passing air
That would be the nose. It warms, filters, and humidifies room air. Its our built in heat and moisture reclaimer.
The nasal cavity filters, humidifies and warms incoming air. It also contains olfactory receptors.
It heats it, humidifies it and filters it.
The respiratory system warms the air to body temperature as it passes through the nasal cavity to prevent damage to the delicate lung tissues. The system humidifies the air by adding moisture to it through the mucous membranes in the respiratory tract, making it easier for oxygen to pass through the respiratory membrane in the lungs. It filters the air by trapping particles and pathogens in the mucus lining of the respiratory tract and then removing them through processes like coughing and swallowing.
The Nostrils or the Nose.
The nose. The nose has three levels of concha. These layers are there to increase the surface area of the nose. The increased surface area gives the air more surface to hit on the way in, and therefore warms it up. The hairs on the inside of the nose are for filtering the air before it gets to the lungs.
The upper respiratory system removes gross particles from the air, warms and humidifies it, and passes it to the lower respiratory system.
The nose warms and filters air headed for the lungs.
Think about it either nose or mouth and the mouth has no means of filtration
The nose warms and humidifies inhaled air. The mucus and cilia (tiny hairs) lining the nasal passages trap particles, including bacteria, that cause infection.
The nasal cavity warms and moistens air as it enters the body.