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A ctenidium is a respiratory organ or gill which is found in many molluscs. This structure exists in bivalves , cephalopods , polyplacophorans (chitons), and in aquatic gastropods such as freshwater snails and marine snails . [ 1 ]
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A siphon is an anatomical structure which is part of the body of aquatic molluscs in three classes: Gastropoda, Bivalvia and Cephalopoda (members of these classes include saltwater and freshwater snails, clams, octopus, squid and relatives). Siphons in molluscs are tube-like structures in which water (or, more rarely, air) flows.
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.
[[Category:Respiratory system templates]] to the <includeonly> section at the bottom of that page. Otherwise, add <noinclude>[[Category:Respiratory system templates]]</noinclude> to the end of the template code, making sure it starts on the same line as the code's last character.
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