Book lung
A book lung is a rudimentary type of lung found in arachnids, such as scorpions and spiders, and in horseshoe crabs. They are not evolutionarily related to mammalian lungs. Their name describes their structure, as they are "folded" like a book. ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ The unfolded "pages" (plates) of the book lung are filled with hemolymph (the arthropod blood). The unfolding maximizes the surface exposed to air, and thereby the chances of gas exchange with the environment. In most species, no motion of the plates is required to facilitate this kind of respiration. ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
Lung: The lung is the essential organ of respiration in air-breathing vertebrates.... Horseshoe crab: The horseshoe crab (Limulus polyphemus), also known as king crab, is an arthropod that is more closely related to spiders than crabs. They are most commonly found in the Gulf of Mexico and along the northern Atlantic coast. A Japanese variant (Tachypleus tridentatus) is found in the Seto Inland Sea,... Evolution: In biology, evolution is the process by which populations of organisms acquire and pass on novel traits from generation to generation, affecting the overall makeup of the population and even leading to the emergence of new species.... Book lung related Images and Photos (experimental) | ~ Table of Content ~
~ Related Subjects ~Respiration (2) - Spider (2) - Arthropod (2) - Mollusk (1) - Worm (1) - Cm (1) - Atlantic (1) - Seto Inland Sea (1) - Inches (1) - Pincer (1) - Biology (1) - New species (1) - Cephalothorax (1) - Invertebrate (1) - Squid (1) -~ Community ~
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