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🔬 Biology  ·  Breathing and Exchange of Gases  ·  NEET

The tiny air sacs of the lungs where gases are exchanged are the:

  • A alveoli
  • B villi
  • C nephrons
  • D neurons

Correct answer: A. alveoli

Explanation: Gas exchange occurs across the thin walls of the alveoli.

Concept context

The mechanics of breathing, lung volumes, gas transport in blood, the Bohr effect, and respiratory regulation.

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