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Phlegm - Wikipedia, the free encyclopedia

Phlegm (pron.: /ˈflɛm/; Greek: φλέγμα "inflammation, humour caused by heat") is a liquid secreted by the mucous membranes of mammalians. Its definition is limited to the mucus produced by the respiratory system, excluding that from the nasal passages, and particularly that which is expelled by coughing (sputum). Phlegm is in essence a water-based gel consisting of glycoproteins, immunoglobulins, lipids and other substances. Its composition varies depending on climate, genetics, and state of the immune system. Its color can vary from transparent to pale or dark yellow and green, from light to dark brown, and even to dark grey depending on the constituents.

Contrary to popular misconception and misuse, mucus and phlegm are not always the same.

Mucus is a normal protective layering around the airway, eye, nasal turbinate, and urogenital tract. Mucus is an adhesive viscoelastic gel produced in the airway by submucosal glands and goblet cells and is principally water. It also contains high-molecular weight mucous glycoproteins that form linear polymers.

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Workshop on a Friday afternoon.

Workshop on a Friday afternoon. | Rina's Random Reveries | Scoop.it
Self-Directed Learning
Haneul Arsad's insight:
Now I realised that I have always been a self-directed learner...it's just that the teachers in those days were not aware of it.
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