Book Lung <2K × 1080p>

The folded design creates a massive surface area in a small space, maximizing oxygen absorption. How They Work

While book lungs are common, some smaller spiders also use a (a network of tubes). book lung

The name comes from the organ's physical structure, which resembles the stacked pages of a book: The folded design creates a massive surface area

Book lungs are believed to have evolved from , which are found in aquatic ancestors like horseshoe crabs. When these creatures moved from water to land, the gills were internalized to prevent them from drying out, becoming the book lungs we see today. Comparison: Book Lungs vs. Tracheae book lung