Diagram Of Fish Gills
Fish eyes are similar to the eyes of terrestrial vertebrates like birds and mammals but have a more spherical lens.
Diagram of fish gills. The body of a typical fish comprises the head trunk and tail. The head bears two eyes with well developed nictitating membrane two internal ears two nostrils which are closed. The gills lie behind and to the side of the mouth cavity and consist of fleshy filaments supported by the gill arches and filled with blood vessels which give gills a bright red colour.
In sharks gill slits are laterally situated while in rays they are ventrally placed. The nostrils of fish are used for the sense of smell. The primary gill lamellae also called gill filament extends from the gill arch and the.
Here hemoglobin in blood circulating in the gills absorbs dissolved oxygen in the water. Fishes are cold blooded animals typically with backbone gills and fins. Fish gills are organs that allow fish to breathe underwater.
There are six or seven pairs of gills in cartilaginous fishes while four pairs in bony fishes due to the loss of spiracle fig. Gills in fish water is capable of holding only low concentrations of oxygen so fish need a different type of exchange system. Gills are tissues that are like short threads protein structures called filaments these filaments have many functions including the transfer of ions and water as well as the.
They were sunfish beautiful gold and green fish with a bright red spot on the edge of each gill cover. In fish the heart pumps blood first to the gills where the gas exchange takes places and then the blood continues to the rest of the body. In fishes gill lamellae are used to increase the surface area between the surface area in contact with the environment to maximize gas exchange both to attain oxygen and to expel carbon dioxide between the water and the blood.
This is a fine balance since the fish s gills like the mammal s lungs have to be thin walled to facilitate gas exchange and thus cannot tolerate high blood pressure. 5 1 a b. In this article we will discuss about the structure of a typical fish.
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