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 heart and lungs (from an older edition of Grays Anatomy) The lung is an organ belonging to the respiratory system and interfacing to the circulatory system of air-breathing vertebrates. ... Orders Acarina Amblypygi Araneae Opiliones Palpigradi Pseudoscorpionida Ricinulei Schizomida Scorpiones Solifugae Uropygi The arachnids, Arachnida, are a class of invertebrate animals in the subphylum Chelicerata. ... A scorpion is an invertebrate animal with eight legs belonging to the order Scorpiones in the class Arachnida. ... Families Suborder Mesothelae Liphistiidae (primitive burrowing spiders) Suborder Mygalomorphae Atypidae (atypical tarantula) Antrodiaetidae (folding trapdoor spider) Mecicobothriidae (dwarf tarantulas) Hexathelidae (venomous funnel-web tarantula) Dipluridae (funnel-web tarantula) Cyrtaucheniidae (wafer trapdoor spider) Ctenizidae (trapdoor spider) Theraphosidae (tarantula) Suborder Araneomorphae Hypochilidae (lampshade spider) Filistatidae (crevice weaver) Sicariidae (recluse spider) Scytodidae (spitting... Binomial name Limulus polyphemus The horseshoe crab (Limulus polyphemus) also known as King Crab, is an arthropod that is more closely related to spiders than crabs. ... This article is about biological evolution. ... Orders Subclass Monotremata Monotremata Subclass Marsupialia Didelphimorphia Paucituberculata Microbiotheria Dasyuromorphia Peramelemorphia Notoryctemorphia Diprotodontia Subclass Placentalia Xenarthra Dermoptera Desmostylia Scandentia Primates Rodentia Lagomorpha Insectivora Chiroptera Pholidota Carnivora Perissodactyla Artiodactyla Cetacea Afrosoricida Macroscelidea Tubulidentata Hyracoidea Proboscidea Sirenia The mammals are the class of vertebrate animals primarily characterized by the presence of mammary...
The unfolded "pages" (plates) of the book lung are filled with hemolymph (the arthropodblood). 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. Hemolymph (or haemolymph) is the blood analogue used by those animals, such as all arthropods and most mollusks, that have an open circulatory system. ... Subphyla and Classes Subphylum Trilobitomorpha Trilobita - Trilobites (extinct) Subphylum Chelicerata Arachnida - Spiders, Scorpions, etc. ... Red blood cells (erythrocytes) are present in the blood and help carry oxygen to the rest of the cells in the body Blood is a circulating tissue composed of fluid plasma and cells ( red blood cells, white blood cells, platelets). ... This is a disambiguation page — a navigational aid which lists other pages that might otherwise share the same title. ... Gas (actually as, part of the Gnu Binutils package) is the default Gcc Back-end. ... In biology, a species is a kind of organism. ... Respiration can refer to: Cellular respiration, which is the use of oxygen in the metabolism of organic molecules. ...
The lungs of mammals have a spongy texture and are honeycombed with epithelium having a much larger surface area in total than the outer surface area of the lung itself.
The inner layer of the sac (visceral pleura) adheres tightly to the lungs and the outer layer (parietal pleura) is attached to the wall of the chest cavity.
The lungs attach to the heart and trachea through structures that are called the "roots of the lungs." The roots of the lungs are the bronchi, pulmonary vessels, bronchial vessels, lymphatic vessels, and nerves.
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