The inside of the nostrils is lined by the nasal mucosa, whose main function is to produce a transparent secretion to block the entry of foreign bodies, such as bacteria and dust, into the body. Most of these impurities are retained by the mucus, which becomes thicker. At the same time, hair cells push this booger down the throat, where it can be swallowed. The problem is that, when the bug is catching, as in the case of severe flu, several particles escape from the gooey filter of the nareba and continue towards the lungs. To avoid this threat, in addition to the defense cells present in the nose, in the bronchial region there are mucous glands that produce a more potent secretion, which will be the basis of the catarrh. Once the invaders are captured, the fight begins inside the phlegm, which thickens with remains of antibodies and microorganisms and changes color: in general, more greenish, when it comes to viruses, or more yellowish, in the case of bacteria. While the stick eats inside the goo, the cilia do their part, pushing the phlegm to the throat. Once this “soup” reaches the throat, there are two options: swallow it or spit it out. And whatever. If you spit, it’s over. If swallowed, the phlegm will be treated by the body like anything ingested: what is useful is reabsorbed, the rest becomes poop.
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