If You Pass This Medical Terminology Quiz, You’re Probably A Doctor

What are alveoli?

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Retry Correct Incorrect When air enters a person’s lungs, alveoli are the tiny sacs inside those organs that actually make that air usable. There are between 300 and 500 million alveoli in the average adult’s lungs.
DeAgostini/Getty Images
DeAgostini/Getty Images

What are alveoli?

  • Another name for the testicles
  • Peptides in the stomach that break food down
  • Small air sacs in the lungs where oxygen is exchanged for carbon dioxide
  • Another name for blood vessels in the brain
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