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A live individual of Pleurobranchaea meckelii; the ctenidium is visible as a feather-like structure in this view of the right-hand side of the animal. A ctenidium is a respiratory organ or gill which is found in many molluscs.
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English: The respiratory system consists of the airways, the lungs, and the respiratory muscles that mediate the movement of air into and out of the body. Español : Diagrama esquemático del sistema respiratorio humano , mostrando los pulmones , los alvéolos , y los músculos que permiten al aire entrar y salir del cuerpo.
A lot of changes in upper respiratory tract and head: 19:27, 13 December 2007: 800 × 900 (330 KB) LadyofHats {{Information |Description=numbered version of Image:Respiratory system complete.svg |Source=self-made |Date=dec 2007 |Author= LadyofHats |Permission=Public domain |other_versions=<gallery> Image:Respiratory system complete.svg|en
Squid_transparent.png (226 × 269 pixels, file size: 60 KB, MIME type: image/png) This is a file from the Wikimedia Commons . Information from its description page there is shown below.
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The mantle cavity functions as a respiratory chamber in most mollusks. In bivalves it is usually part of the feeding structure. In some mollusks the mantle cavity is a brood chamber, and in cephalopods and some bivalves such as scallops, it is a locomotory organ. The mantle is highly muscular.
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