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post in: News, Video Date:09 Oct 2017, 09:06 views:1254
Background, the word creek asthma originates from an ancient Greek word meaning panting. Essentially, asthma is an inflammatory lung condition that makes it difficultto breathe properly. When any person inhales, the air travels through the following structures: Air passes into the lungs and flows through progressively smaller airways called bronchi and then bronchioles.
The lungs contain millions of asthma these airways. All bronchioles lead to alveoli, which are microscopic sacs where oxygen and carbon dioxide are exchanged.
The major features of the lungs include the bronchi, the bronchioles, and the alveoli. The alveoli are the microscopic blood vessel-lined sacks in which oxygen and carbon dioxide gas are exchanged. Asthma is a chronic condition in which these airways undergo changes when stimulated by allergens or other environmental triggers.
Such changes appear to be two specific responses: The hyperreactive response (also called hyperresponsiveness the inflammatory response.
These actions in the airway cause coughing, wheezing, and shortness of breath (dyspnea the classic symptoms of asthma. Hyperreactive Response, in the hyperreactive response, smooth muscles in the airways of the lungs constrict and narrow excessively in response to inhaled allergens or other irritants. Everyone's airways respond by constricting when exposed to allergens or irritants, but a special hyperreactive response occurs in people with asthma: When people without asthma breathe in and out deeply, the airways relax and open to rid the lungs of the irritant.
When people with asthma try to take those same deep breaths, their airways do not relax and narrow, causing patients to pant for breath. Smooth muscles in the airways of people with asthma may have a defect, perhaps a deficiency in a critical chemical that prevents the muscles from relaxing. And, during an asthma attack the airways narrow, making breathing difficult.
Inflammatory Response, the hyperreactive stage is followed by the inflammatory response, which generally contributes to asthma in the following way: In response to allergens or other environmental triggers, the immune system delivers white blood cells and other immune factors to the airways. These so-called inflammatory factors cause the airways to swell, to fill with fluid, and to produce a thick sticky mucus.