have any animals have gills
With gills get oxygen from the water, most aquatic species: fish, many aquatic invertebrates (such as polychaete worms, mollusks perlovitsy, branchiopoda crustacean branhipus larva mayflies) and some larval amphibians(eg, tadpoles). In cyclostomes (predators or parasites of fish) breathing through gill pouches.
primitive gills have annelids.Most of the higher crustaceans the respiratory system are located on the side walls of the body and upper thoracic legs.Aquatic insect larvae have tracheal gills, which are thin-walled outgrowths on different parts of the body, which has a network of tracheas.
From echinoderms gills are starfish and sea urchins.All protoaquatic chordates (fish) have a series of pairs of holes (gill slits), located in the throat.In Enteropneusta (mobile benthic animals), tunicates (small marine animals with a bag-shaped body coated) and bescherepnyh (a special group of invertebrates) gas exchange occurs during the passage of water through the gill slits.
How do animals breathe with gills
Gills consist of leaflets (threads), inside which is a network of blood vessels.The blood is separated into them from the external environment is very thin skin, this creates the desired conditions for the exchange between the gases dissolved in the water and blood.Gill slits of fish are separated by arcs, which depart from the gill septum.Some types of bone and cartilage onto gills arranged at the outer side edges in two rows.Actively swimming fish have gills with a much larger surface area than the slow-moving aquatic animals.
In many invertebrates, these young tadpoles respiratory system are on the outside of the body.In fish, crustaceans and higher they are hidden under the protective devices.Frequently gills arranged in special cavities of the body, they may be covered with special folds or leathery skin covers (gill lids) for protection from damage. Gills also perform the function of the circulatory system.
movement during breathing gill cover is made simultaneously with the movement (opening and closing) of the mouth.When breathing fish opens its mouth, pulls into the water and closes the mouth.Water acts on the respiratory system, passes through and goes out.Oxygen is absorbed by capillary blood vessels located in the gills and the used carbon dioxide escapes through them into the water.