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- Gill_slit abstract "Gill slits are individual openings to gills, i.e., multiple gill arches, which lack a single outer cover. Such gills are characteristic of cartilaginous fish such as sharks, and rays. Most of these have five pairs, but a few species have 6 or 7 pairs. Shark gill slits are not covered, but lie in a row behind the head. The anterior edge of a gill slit is motile, moving outward to allow water to exit, but closing to prevent reverse flow. This modified slit, called a spiracle, lies just behind the eye, which assists the shark with taking in water during respiration and plays a major role in bottom–dwelling sharks. Spiracles are reduced or missing in active pelagic sharks. While the shark is moving, water passes through the mouth and over the gills in a process known as "ram ventilation". While at rest, most sharks pump water over their gills to ensure a constant supply of oxygenated water. A small number of species have lost the ability to pump water through their gills and must swim without rest. These species are obligate ram ventilators and would presumably asphyxiate if unable to move. Obligate ram ventilation is also true of some pelagic bony fish species. In contrast, bony fishes have a single outer bony gill covering called an operculum.The true gill slits in embryonic fish develop into fish gills. However, the slits in tetrapods do not, so a more general name for the vertebral structures is pharyngeal slits. Gill slits likely originated from pharyngeal slits in tunicates that were used for filter-feeding. The term "gill slits" has also been used to refer to the folds of skin in the pharyngeal region in embryos. It is now accepted that it is the vertebrate pharyngeal pouches and not the neck slits that are homologous to the pharyngeal slits of invertebrate chordates.".
- Gill_slit thumbnail Grey_Reef_Shark.jpg?width=300.
- Gill_slit wikiPageID "3460783".
- Gill_slit wikiPageLength "2682".
- Gill_slit wikiPageOutDegree "24".
- Gill_slit wikiPageRevisionID "549444456".
- Gill_slit wikiPageWikiLink Aquatic_respiration.
- Gill_slit wikiPageWikiLink Asphyxia.
- Gill_slit wikiPageWikiLink Asphyxiate.
- Gill_slit wikiPageWikiLink Batoidea.
- Gill_slit wikiPageWikiLink Bony_fish.
- Gill_slit wikiPageWikiLink Category:Fish_anatomy.
- Gill_slit wikiPageWikiLink Chondrichthyes.
- Gill_slit wikiPageWikiLink Chordate.
- Gill_slit wikiPageWikiLink Chordates.
- Gill_slit wikiPageWikiLink External_gills.
- Gill_slit wikiPageWikiLink Eye.
- Gill_slit wikiPageWikiLink Filter-feeding.
- Gill_slit wikiPageWikiLink Filter_feeder.
- Gill_slit wikiPageWikiLink Fish_gill.
- Gill_slit wikiPageWikiLink Gill.
- Gill_slit wikiPageWikiLink Gill_raker.
- Gill_slit wikiPageWikiLink Gills.
- Gill_slit wikiPageWikiLink Operculum_(fish).
- Gill_slit wikiPageWikiLink Osteichthyes.
- Gill_slit wikiPageWikiLink Pelagic.
- Gill_slit wikiPageWikiLink Pelagic_zone.
- Gill_slit wikiPageWikiLink Pharyngeal_slit.
- Gill_slit wikiPageWikiLink Shark.
- Gill_slit wikiPageWikiLink Spiracle.
- Gill_slit wikiPageWikiLink Tetrapod.
- Gill_slit wikiPageWikiLink Tunicate.
- Gill_slit wikiPageWikiLink File:Grey_Reef_Shark.jpg.
- Gill_slit wikiPageWikiLink File:Lamprey.svg.
- Gill_slit wikiPageWikiLinkText "Gill slit".
- Gill_slit wikiPageWikiLinkText "gill membranes".
- Gill_slit wikiPageWikiLinkText "gill opening".
- Gill_slit wikiPageWikiLinkText "gill slit".
- Gill_slit hasPhotoCollection Gill_slit.
- Gill_slit wikiPageUsesTemplate Template:Animal-anatomy-stub.
- Gill_slit wikiPageUsesTemplate Template:Diversity_of_fish.
- Gill_slit wikiPageUsesTemplate Template:Fish-stub.
- Gill_slit wikiPageUsesTemplate Template:Reflist.
- Gill_slit subject Category:Fish_anatomy.
- Gill_slit comment "Gill slits are individual openings to gills, i.e., multiple gill arches, which lack a single outer cover. Such gills are characteristic of cartilaginous fish such as sharks, and rays. Most of these have five pairs, but a few species have 6 or 7 pairs. Shark gill slits are not covered, but lie in a row behind the head. The anterior edge of a gill slit is motile, moving outward to allow water to exit, but closing to prevent reverse flow.".
- Gill_slit label "Gill slit".
- Gill_slit sameAs Žaberní_štěrbina.
- Gill_slit sameAs Fente_branchiale.
- Gill_slit sameAs Fessura_branchiale.
- Gill_slit sameAs Kieuwspleet.
- Gill_slit sameAs m.09dp8m.
- Gill_slit sameAs Зяброві_щілини.
- Gill_slit sameAs Khe_mang.
- Gill_slit sameAs Q3068417.
- Gill_slit sameAs Q3068417.
- Gill_slit wasDerivedFrom Gill_slit?oldid=549444456.
- Gill_slit depiction Grey_Reef_Shark.jpg.
- Gill_slit isPrimaryTopicOf Gill_slit.