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Question

Where in the respiratory system does oxygen, from the air breathed in pass into the blood. 

Option 1 : trachea

Option 2  :bronchi 

Option 3 : bronchioles 

OpOpti 4 : alveoli 


Solution

The primary function of the respiratory system is to exchange oxygen and carbon dioxide. Inhaled oxygen enters the lungs and reaches the alveoli. Oxygen passes quickly through this air-blood barrier into the blood in the capillaries. Similarly, carbon dioxide passes from the blood into the alveoli and is then exhaled.
Hence the correct answer is option D Alveoli

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