Book Lungs And Book Gills

Fish and other aquatic creatures like most crabs have gills to extract oxygen out of the water.

Book lungs and book gills. Fish and aquatic animals have gills for breathing. In spiders the book lungs are paired respiratory organs composed of 10 to 80 hollow leaves that extend into a blood sinus separated by small hardened columns. A both assertion and reason are true and reson is the correct explanation of assertion.

Book gills are flap like appendages that effect gas exchange within water and seem to have their origin as modified legs. Some have a pair of book lungs others have several pairs. Microwhip scorpions harvestmen acarina pseudoscorpions ricinulei and sunspiders.

One of the long running controversies in arachnid evolution is whether the book lung evolved from book gills just once in a common arachnid ancestor or whether book lungs evolved separately in several groups of arachnids as they came onto land. Book gills are still found in horseshoe crabs which have five pairs of them the flap in front of them being the genital operculum which lacks gills. A arthropods have respiratory organs like gills book gills book lungs or tracheal system.

The book gills get their name because they are made up of thin membranes that look a lot like the pages of a book. Gills are the organs that are specialized organs to perform respiration in water just like lungs are specialized organs to breath in air. Book gills are type of gills found in some aquatic arthropods like horshoe crab and composed of numerous membranous structures arranged like leaves of the book resembling the closed book.

Let s take a moment to explore the form and function of the horseshoe crab s. I was planning for it to breathe through book gills or book lungs but wanted to make sure my design is biologically possible. Creatures like primitive spiders have book lungs they live in air but usually.

B both assertion and reason are true but reason is not the correct explanation of assertion. Book gills are found externally while book lungs are found internally. Thus i had a number of questions concerning book gills and book lungs.