Movement of mucus Cilia in the nose move the
mucus formed there towards the throat where it is
swallowed and digested in the stomach. In cold weather,
this process slows and the mucus sometimes gathers in
the nose and drips or dribbles out – a winter runny nose.
Particles larger than 4mm in diameter usually become
trapped in mucus in the nose and rarely get any further
down the airways. The nasal mucosa has many sensory