Where is the snot come from when caught a cold in winter?

Nasal mucosa has a rich capillary, capillary permeability has a strong, able to secrete much viscous liquid, so always keep moist nasal mucosa. Its secretion of mucus that is, the nose. Air through the nasal cavity when shouting with cyanide gas into the dust, particulate matter, bacteria and so on. They live in the vast majority of adsorption was mucus to form a runny nose, discharge from nostrils. Or forward to the direction of movement of the throat to stimulate the throat, caused by a conditioned reflex, spit from the mouth, or through the throat into the esophagus, stomach.
It is mainly composed of mucous, function on the main wetting and heating are called into the air, reducing the drying gas on lung irritation. Winter cold, dry, your experience will be deep. Mucus also contains lysozyme, can kill by adhesion of bacteria, with immune function.
When cold, air-conditioning so that nasal mucosa capillary contraction and return to the warmth of the environment also Diastolic blood vessels, and so repeatedly, vascular elasticity will become weak, has been in a state of relaxation, when the permeability of its relatively strong, so have a nose on the constant. In addition, bacteria decompose organic matter and kill bacteria in the body, so a yellow nose.
Doctor under the nose of the state, color, odor and bacterial culture can be analyzed, such as diagnosis of the disease.

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