Multiple choice

Book lungs are the respiratory organs in:

  1. Protozoans

  2. Cnidarians

  3. Arthropods

  4. Amphibians

  5. Mammals
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Book lungs are respiratory organs found in arthropods, specifically arachnids (spiders, scorpions) and some myriapods. They are leaf-like, stacked structures that maximize gas exchange surface area. Protozoans use diffusion, cnidarians use direct diffusion, amphibians use skin/lungs/gills, and mammals use alveolar lungs - none have book lungs.

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