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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.
17 gen 2020 · But instead of lungs, they use gills. 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 ...
Fish gills are composed of thin filaments that are covered in tiny projections called lamellae. The lamellae provide a large surface area for gas exchange. In addition, fish gills are rich in blood vessels, which helps to transport oxygen to the rest of the body. The evolution of gills can be traced back to the earliest aquatic organisms.
15 nov 2008 · 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 ...
- Steven F. Perry
- 2008
26 mar 2024 · We propose that future research should explore ionocyte homology and function across extant deuterostomes to test this hypothesis and others in order to determine the ancestral origins of ion regulation in fish gills.
Carbon dioxide passes from the blood through the thin gill tissue into the water. Gills or gill-like organs, located in different parts of the body, are found in various groups of aquatic animals, including mollusks, crustaceans, insects, fish, and amphibians.
Because the branchial epithelium is essentially a monolayer of mixed cells (mostly squamous PVCs on the lamellar surface), and the medium irrigates the external surface countercurrent to the internal perfusion (see sect. ii), the fish gills appear to be ideal for gas exchange.
