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What are the microscopic sacs in the lungs known as?

  1. Bronchi

  2. Alveoli

  3. Aerola

  4. Capillaries

The correct answer is: Alveoli

The microscopic sacs in the lungs are known as alveoli. These tiny structures are crucial for the respiratory process because they provide a large surface area for gas exchange. Within the alveoli, oxygen from the air is absorbed into the blood, while carbon dioxide from the blood is expelled into the air to be exhaled. This exchange takes place due to the thin walls of the alveoli, which allow for efficient diffusion of gases. Understanding the function and structure of alveoli is essential for anyone studying respiratory physiology, as they play a critical role in maintaining proper oxygen levels in the body and removing carbon dioxide, a waste product of metabolism.