Значение термина gill-slit в knolik
gill-slit - gill-slit
gill-slit - Opening from side of pharynx to exterior in aquatic chordates. Usually vertically elongated, several lying in a series one behind the other on each side. Primitively probably concerned in filtering food particles from water pumped through them by action of cilia (as in tunicates and amphioxus). In fish and some Amphibia serve for respiration, the water, which is pumped through by muscular action, oxygenating blood in the gills. Absent in adult tetrapod vertebrates, except in a few Amphibia, but occur in many tetrapod embryos. See also: Gill-Pouch. Presence of gill-slits, or at least of gill-pouches and corresponding epidermal grooves at some stage of development, is a characteristic of phylum Chordata.
Рядом со словом gill-slit в knolik
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