Fish Gills | Basic BiologyWith an interdisciplinary background, she has worked across a number of disciplines including Sociology, Gender Studies and Media and Communications. She joined City, University of London in October Professor Gill is known for her research interests in gender and media, cultural and creative work, and mediated intimacy. Professor Gill recently collaborated on a 4 year Marsden Royal Society project, led by Sue Jackson and Tiina Vares, exploring how pre-teen year old girls negotiate living in an increasingly sexualized culture. For more information see www.
39.1B: Skin, Gills, and Tracheal Systems
Respiration can occur using a variety of respiratory organs in different animals, including skin, gills, and tracheal systems. There are various methods of gas exchange used by animals. As seen in mammals, air is taken in from the external environment to the lungs. Other animals, such as earthworms and amphibians, use their skin integument as a respiratory organ. A dense network of capillaries lies just below the skin, facilitating gas exchange between the external environment and the circulatory system. The respiratory surface must be kept moist in order for the gases to dissolve and diffuse across cell membranes. Organisms that live in water also need a way to obtain oxygen.
Drop your spare change here A look at the underside of the horseshoe reveals six paired appendages. The horseshoe uses the first pair the chelicera for placing food in its mouth. The next pair of appendages are the pedipalps ; these are the first ambulatory legs. In the adult male, the tarsus of these legs are modified as a grasping appendage, allowing males to clasp the female during spawning. The "last" legs are the " pusher" legs , used for locomotion. Looking closely at this appendage mouse over the label for detail , there is a spatulate organ that forms part of the leg, called the flabellum , whose function is to test the composition of the water passing to the gill chamber.
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.
The circulatory system
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.