The body uses mucus to moisten inhaled air as it passes through the nasal passages. Mucus helps to humidify the air, trap foreign particles, and prevent the respiratory tract from drying out.
You cannot get frostbite on your lungs -- your nose and throat warms inhaled air, while circulating blood warms the lungs.
Oceans, lakes, and bodies of water are the major sources of moisture that warm and moisten air through evaporation. As the water evaporates, it adds humidity and warmth to the air. Additionally, sunlight can also warm and moisten air through direct heating.
Mucous membranes and cilia in the trachea trap and eliminate particulate matter from inhaled air. The membranes also warm and moisten incoming air.
The epithelium of the respiratory tract contains mucous cells which adds moisture and there are blood vessels close to its' surface that add warmth to the air.
The three major functions of the nasal cavity are to warm, moisten, and filter the air that is inhaled. The nasal cavity also helps to detect and process odors through specialized olfactory receptors. Additionally, it contributes to resonating sound during speech.
The nose warms and humidifies inhaled air. The mucus and cilia (tiny hairs) lining the nasal passages trap particles, including bacteria, that cause infection.
True Mucus helps moisten warm and filter the air as it enters the nose.
Inhaled air is warmed and moistened in the nasopharynx and oropharynx.
Inhaled air is typically warmed and humidified as it passes through the nasal passages. The purpose of this process is to protect the delicate tissues of the respiratory system from damage due to cold and dry air.
Exhaled air is heavier than inhaled air. This is because exhaled air contains higher levels of carbon dioxide, which is denser than the oxygen-rich air that is inhaled.
It's the part of the pharynx (area at the back of the throat) which connects with the nasal passages. Its specific function is simply to allow air passage effectively through it, in either direction. It mechanically filters, moisturizes, and warms inhaled air.