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SAI International School
                                               Subject- Biology, Class-VII
                                         Chapter- Respiration in Organisms
                                         Subtopic- Mechanism of Breathing
                                                         Module- 14
                                                       Lesson Notes

                   THE MECHANISM OF BREATHING IN HUMAN BEINGS







































                                        Fig-The Respiratory System in Humans

               Breathing  is  a  continuous  process  in  which  humans  breathe  in  oxygen  rich  air  and
               breathe out carbon dioxide rich air from the body.


               Breathing consists of two phases:

                     Inhalation - the process of taking in air
                     Exhalation - the process of giving out air.







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