B: Skin, Gills, and Tracheal Systems - Biology LibreTextsI am designing a hypothetical amphibious creature capable of respiration in both air and water. I was planning for it to breathe through book gills or book lungs, but wanted to make sure my design is biologically possible. Thus, I had a number of questions concerning book gills and book lungs:. I read that the book gills of horseshoe crabs differ from book lungs in being external structures, while book lungs are internal. Is that the only difference between book gills and book lungs? If it is, then my creature has book lungs, not book gills.
This article is intended for an audience of contemporary designers and students who are at least one step removed from mid-century British typographic culture; it is a critique of the Gill Sans typeface and the idiosyncrasies of its creation from a contemporary perspective. Gill Sans: Pride of England? Gill Sans is the Helvetica of England; ubiquitous, utilitarian and yet also quite specific in its ability to point to our notions of time and place. How do you do British post-war design? But it is a flawed masterpiece. How flawed? Well, monumentally flawed, in fact.
Fish breathe through gills instead of lungs. Just like all other animals, fish need oxygen to survive. Because they live in water, they have evolved gills which enable them to remove dissolved oxygen from water. Most fish have four gills on both sides of their head. Sharks and other more primitive fish may have five or more gill slits.
It has ten eyes, muscles, a heart that is made up of a long tube, blue blood ( used extensively in the medical field), and book gills that are used for swimming.
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Gills and lungs are the two structures commonly used by animals for respiration. Both are characterized by large amounts of surface area that function in gas exchange. The difference between them is that gills involve external extensions from the body surface, whereas lungs possess internal foldings. Gills have evolved independently several times in a variety of animal groups. Among the annelids, certain species of terrestrial worms have long slender, branching gills which extend from the body. Horseshoe crabs possess structures known as book gills, which are actually modified appendages that function in gas exchange. Crustaceans also have gills that have been modified from thoracic or abdominal appendages.