CBSE Class 7: Mechanism of Breathing in Human Beings Videos | Respiration

• what is tissue
• respiration is breaking down of food to produce
• why do we cough
• INSPIRATION IS THE PROCESS OF   
• Where are the lungs located in our body  
• Why is it neccesary to keep our nose clean?  
• what is alveoli
• what are alveoli?  
• The given graph shows changes in the pressure in lungs during breathing.
  
• Why do testube with snail and plant both have higher concerntration of carbon dioxide than only snail or only water plant/

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