BOW 9 Find an example and a picture of each type of disease/pathogen: bacteria, virus, prion, genetic, environmental and invertebratesBOW 9 Find an example and a picture of each type of disease/pathogen: bacteria, virus, prion, genetic, environmental and invertebratesBOW 9 Find an example and a picture of each type of disease/pathogen: bacteria, virus, prion, genetic, environmental and invertebrates

Asthma is caused by inflammation in the airways. When an asthma attack occurs, the muscles surrounding the airways become tight and the lining of the air passages swells. This reduces the amount of air that can pass by.In sensitive people, asthma symptoms can be triggered by breathing in allergy-causing substances (called allergens or triggers). Common asthma triggers include animals (pet hair or dander), dust, changes in weather (most often cold weather), chemicals in the air or in food, exercise, mold, pollen, respiratory infections, strong emotions (stress), tobacco smoke. Aspirin and other nonsteroidal anti-inflammatory drugs (NSAIDs) provoke asthma in some patients. Many people with asthma have a personal or family history of allergies, such as hay fever (allergic rhinitis) or eczema. Others have no history of allergies and is caused by the enviroment. So asthma can be both enviromental and gentetic.


http://www.ncbi.nlm.nih.gov/pubmedhealth/PMH0001196/figure/A000141.B19346/?report=objectonly