Oxygen enters through the nostrils into the respiratory tract, then it passes through the trachea also known as the wind pipe. Then passing through bronchus the oxygen enters into the lungs through bronchioles, which divide into alveolar ducts. The alveolar ducts enters the alveoli. Through the thin walls of alveoli gaseous exchange takes place between capillaries and alveoli
So, the correct answer is 'Alveoli'
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