Multiple choice

primary organ for respiration in humans

  1. gills

  2. nose

  3. mouth

  4. lungs

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

The lungs are the primary organs of the human respiratory system, where the exchange of oxygen and carbon dioxide takes place. While the nose and mouth serve as entry points for air, gas exchange occurs in the alveoli of the lungs.