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Unit 19: Biology Part 2                                                    Page 61 of 137


               explain the flow of oxygen                         short period of time, or chronic,
               carbon dioxide in the alveoli                      which means they last for a long
                                                                  time.  Many things cause
                                                                  respiratory diseases.  They can be
                                                                  caused by bacteria, or things in the
               Breathing Versus                                   environment like tobacco smoke.
               Respiration                                        Other respiratory diseases are
                                                                  hereditary, which means that
               Sometimes, people will say                         parents can pass them on to their
               “breathing” and “respiration” as                   children.
               though they were the same thing,
               but they are actually very different.              Bronchitis
               What we have been talking about

               so far is breathing.                               Bronchitis is an extremely
                                                                  common respiratory system
               This is the process where air enters               disease.  In fact, you’ve probably
               the body, goes into the lungs, and                 has bronchitis a few times in your

               exchanges its oxygen for carbon                    life.  This disease occurs when the
               dioxide.  This is part of respiration,             bronchi become inflamed.  Acute
               and is known as external                           bronchitis is usually caused by a
               respiration, but it only half of full              virus or bacterium, and can last
               respiration.                                       from several days to a week.
                                                                  People with acute bronchitis
               Respiration also includes internal                 usually have a cough that produces
               respiration, where the blood, full                 mucus.  They may also be short of
               of oxygen, goes to the parts of the                breath or wheeze.  Chronic
               body that need it.  This process                   bronchitis lasts at least three
               can be learned about in a                          months over a two year period.
               discussion of the circulatory                      The most common cause of chronic
               system, another body system.                       bronchitis is smoking, although it

                                                                  can be caused by pollution or
               Respiratory System                                 smoke in the air.  Bronchitis is

               Diseases                                           treated with antibiotics.


               There are many diseases involving
               the respiratory system.  These
               diseases, like all diseases, can be
               acute, which means they last for a





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