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Fish gills are organs that allow fish to breathe underwater. Most fish exchange gases like oxygen and carbon dioxide using gills that are protected under gill covers (operculum) on both sides of the pharynx (throat). Gills are tissues that are like short threads, protein structures called filaments.
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Gills are branching organs located on the side of fish heads that have many, many small blood vessels called capillaries. As the fish opens its mouth, water runs over the gills, and blood in the capillaries picks up oxygen that's dissolved in the water. Then the blood moves through the fish's body to deliver the oxygen, just like in humans.
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Fish are aquatic vertebrates. They make up more than half of all vertebrate species. They are especially important in the study of vertebrate evolution because several important vertebrate traits evolved in fish. Fish show great diversity in body size. They range in length from about 8 millimeters (0.3 inches) to 16 meters (about 53 feet).
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Gross Anatomy. All modern fishes have four respiratory gill arches and a 5th non-respiratory arch on each side of the buccal cavity. Each respiratory arch is composed of a cartilaginous supporting structure which bears gill rakers in the front and respiratory tissue in the rear. The gill rakers act like a strainer to keep food items from.
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A gill ( / ษกษชl / โ) is a respiratory organ that many aquatic organisms use to extract dissolved oxygen from water and to excrete carbon dioxide. The gills of some species, such as hermit crabs, have adapted to allow respiration on land provided they are kept moist.
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Gill filaments extend out horizontally from the gill arches. Each gill filament produces many branches called primary lamellae and the primary lamellae branch out into tiny secondary lamellae. The secondary lamellae run parallel to the flow of the water and absorb oxygen from the water into the fish's body.
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Red represents a higher value (e.g. of temperature or the partial pressure of a gas) than blue so the property being transported in the channels flows from red to blue. In fish a countercurrent flow (lower diagram) of blood and water in the gills is used to extract oxygen from the environment. All basal vertebrates breathe with gills.
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The innate and adaptive immune system of fish. C.J. Secombes, T. Wang, in Infectious Disease in Aquaculture, 2012 1.2.4 The gills. The fish gill is a multifunctional organ involved in gas exchange, ionoregulation, osmoregulation, acid-base balance, ammonia excretion, hormone production, modification of circulating metabolites and immune defence (Rombough, 2007).
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Image: Fish gill diagram Fish gills are adapted for aquatic respiration, meaning they can extract oxygen dissolved in water and eliminate carbon dioxide from the body. Fish gill is an organ in fish, located at the side of the head that helps them to breathe and extract oxygen from their aquatic environment.
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Functionally, the mechanism for pumping water over the radiator-like gills seems to vary depending on the species of fish. In general, this is achieved by the fish lowering the floor of the mouth and widening the outer skin flap that protects the gills, called the operculum. This increase in volume lowers the pressure within the mouth causing.
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Fish - Digestion, Anatomy, Nutrition: The structure of a fish's digestive system consists of the mouth, teeth and gill rakers, esophagus, stomach, pyloric ceca, pancreas, liver, intestine, sometimes a cloaca, and anus. The stomach and intestine varies greatly in fishes, depending upon the diet.
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INTRODUCTION It is known from the extensive measurements of Gray (1954) that the gills of marine fishes of the Atlantic Coast of North America show a wide variation in the extent of their gill area. This is true whether the area is based on the unit of body surface area or on a unit of body weight.
Why is the rate of breathing in aquatic organisms much faster than in terrestrial organisms?(a
Gyotaku (pronounced gee yo TAH koo) is a traditional Japanese method of printmaking, which uses the whole fish. This method can produce an accurate image of a fish (Fig. 4.19). Gyotaku is a relatively new art form that developed in Japan, probably in the early- to mid-nineteenth century. Gyotaku means 'fish rubbing.'
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A complete gill is known as holobranch. It consists of a bony or cartilaginous arches. The anterior and posterior part of each gill arch possesses plate-like gill filaments. Each holobranch consists of an anterior (oral) and a posterior (aboral) hemi-branch (Fig. 5.4 a, b, c, d).
Figure 1 from A first look at how fish gills work. Semantic Scholar
Gills allow fish, mollusks, amphibians, and crustaceans to breathe underwater.. External & Internal Anatomy of a Fish | Diagrams & Functions Jawless Craniates: Class Myxini & Class.
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In his classic 1966 paper, `The dimensions of fish gills in relation to their function' ( Hughes, 1966 ),Hughes founded the modern age of gill biophysics, by measuring various gill tissue dimensions in fish ranging from 12 g mackerel ( Trachurus trachurus) to 1.5 kg angler fish ( Lophius piscatorius ), to analyse gill resistance to water flow.