Multiple choice

The ends of alveolar ducts are termed as

  1. bronchioles

  2. trachea

  3. bronchi

  4. alveoli

Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Alveoli are tiny ends of the alveolar ducts. These tiny air sacs function to exchange oxygen and carbon dioxide in the blood. Certain respiratory diseases cause a thickening of the alveoli walls, which restricts movement, causing breathing difficulties.