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State PCS PYQPrelims 2021

UPPCS · Question 79

The site of gaseous exchange in the lungs is:

  1. Tracheoles
  2. Bronchioles
  3. Pulmonary vein
  4. Alveoli
Show answer & explanation

Answer: (D) Alveoli

Explanation

Gas exchange occurs across the thin walls of the alveoli.