Site pages
Current course
Participants
General
Topic 1
Topic 2
Topic 3
Topic 4
Topic 5
Topic 6
Topic 7
Topic 8
Topic 9
Topic 10
Topic 11
Topic 12
Topic 13
Topic 14
Topic 15
Topic 16
Topic 17
Topic 18
Topic 19
Topic 20
Topic 21
Topic 22
Topic 23
Topic 24
Topic 25
Topic 26
Topic 27
Topic 28
Topic 29
Topic 30
Topic 31
Topic 32
Topic 33
Topic 34
Topic 35
Topic 36
Exogenous pigments 1
Colouring agents Colouring agents are called as pigments. Tissues may be discoloured (e.g. Jaundice, tattoo) or excessively coloured (e.g. Melanosis) in diseases.
Exogenous pigmentations In exogenous pigmentations colouring substances can enter the body by three different routes.
Of these three entries, entry through respiratory route is the most common pathway for exogenous pigmentations. This results in pneumoconiosis characterized by pigmentation and fibrosis. Pneumoconiosis is a general term applied for any permanent deposition of substantial amounts of particulate matter in lung disease by inhalation; Depending upon the type of exogenous pigment, the conditions are termed as follows
Anthracosis
Silicosis Silicosis is deposition of silica in the lung. The condition is more common in human beings than in animals as an occupational hazard who are working in mines and quarries. The crystalline form of silica is more harmful irritant than amorphous form. The silica is a powerful irritant and is insoluble in body fluids.
|