If you're seeing this message, it means we're having trouble loading external resources on our website.

If you're behind a web filter, please make sure that the domains *.kastatic.org and *.kasandbox.org are unblocked.

Main content
Current time:0:00Total duration:6:30

Video transcript

so occupational lung diseases are diseases of the lung that occur in response to some occupational or some work-related exposure and at least in the developed world the most common type of occupational lung disease is occupational occupational occupational asthma okay so the most common type of occupational lung disease is occupational asthma and you probably heard a plain old regular asthma before but what distinguishes occupational asthma from regular old asthma is firstly that occupational asthma is something that develops in adulthood so it's a type of adult onset asthma and secondly occupational asthma occurs in response to some trigger that's found at work so these patients will often experience signs and symptoms of asthma when they're at work when they're being exposed to this trigger at work but when they come home within a few hours of coming home these symptoms will resolve on their own and on days that they don't go into work such as let's say the weekend they don't experience these signs and symptoms of asthma alright so here's a lung okay and let's say I was to take take a cross-section of one of these Airways like that and I was to look at that head-on so that this is my eye over here what I would see would be something like this I'd see the wall of the airway this is the wall of the airway and on the inside this is the inner lining or actually that's not really good so on the inside what I T is the inner lining of the airway okay so that this hole in the center is a lumen through which the air actually travels so this white arrow that I'm drawing is the air traveling through the lumen of the airway alright so what happens in occupational asthma is in response to some work-related trigger some work-related trigger a couple of changes occur to this airway okay so firstly what happens today away is that it becomes smaller okay so you can see this Airways smaller than it normally is and secondly you see that secondly you see that the lumen of the airway becomes smaller as well and just looking at this very plain and simplistic diagram you can see that trying to breathe through this airway is much more difficult than trying to breathe through a normal airway and this is what accounts for the symptoms of asthma so I guess what's left to explore is what are these work-related triggers that I'm talking about and actually there have been greater than 350 described causes of occupational asthma okay and at least in the United States the most common cause one of the most common causes is different types of flowers so that bakers are at increased risk and also different types of isocyanates and isocyanates are these molecules that different industry workers such as plumbers such as plumbers and those who work with roofing and and painters can oftentimes become exposed to and also insulators can become exposed to okay and something that's it really important to keep in mind is that even though there are 350 identified causes not everyone exposed to one of these causes is going to develop occupational asthma all right so occupational asthma most common type of occupational lung disease now let's move on to another type of occupational lung disease and that is we get that squared away and that is mesothelioma so Meisel Meisel c li OMA mesothelioma okay and i'm sure you've heard a mesothelioma before because it's it's hard to watch even a day of TV without encountering one of those ads about mesothelioma and how you or loved one with mesothelioma are entitled to compensation all right so what is mesothelioma well first let's explore the lining of the lungs so in pink over here you see the visceral pleura so this is this is the lining of the lung that's directly adjacent to the lung closest to the lung and then what you see an orange over here is the parietal pleura the parietal pleura okay so the pleura varietal Flores the lining of the lung that's adjacent to the chest wall so further away from the lung now the pleura or the lining of the lung is made up of cells called Meisel figlio mesothelial cells okay and measles filiol cells have this really important function they secrete this fluid that comes in between these two layers of the pleura and this fluid is really important because it reduces the friction between the two layers of the pleura okay and mesothelioma is a cancer of mesothelial cells and the reason why we consider it in occupational lung diseases because mesothelioma is related to asbestos exposure it's related to asbestos exposure and asbestos exposure occurs with many types of occupations such as painters painters can be exposed to asbestos as can shipyard workers shipyard shipyard workers in and also those in plumbing so plumbers can also become exposed to asbestos and something unfortunately to keep in mind about mesothelioma is that unfortunately mesothelioma has a very high associated mortality a very high associated mortality okay and so those those are two of the two types of occupational lung diseases and now we'll consider some other types