How Nasal Blood Vessels Humidify and Warm Air Intake

Blood vessels within the nasal cavities moisten air.

The nasal cavities are lined with a mucous membrane that contains many blood vessels. These blood vessels help to warm and humidify the air that we breathe in. When we breathe in cold, dry air, the blood vessels in the nasal cavities swell up and release mucus. This mucus helps to trap dust, pollen, and other allergens, and it also helps to warm and humidify the air.