How are the lungs designed in human beings to maximise the area for exchange of gases?


  • The respiratory system starts from the nostrils , extending into a trachea (windpipe).
  • As the trachea extends, it divides into two tubes called the bronchi which are connected to each lung.
  • These bronchi further branch into numerous bronchioles , which end in small balloon shaped structures called alveoli
  • These alveoli provide a maximum area for the exchange of gases to occur. Being surrounded by thin walls and blood capillaries, the exchange of gases is most effective here.

Exchange of gases at alveoli - Teachoo.jpg

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Maninder Singh

CA Maninder Singh is a Chartered Accountant for the past 14 years and a teacher from the past 18 years. He teaches Science, Economics, Accounting and English at Teachoo