In the Cephalopoda respiratory currents are produced by contractions of the muscles of the funnel (Nautilus)and mantle (Dibranchia). Completing the CAPTCHA proves you are a human and gives you temporary access to the web property. jalaldeen361976 jalaldeen361976 12.10.2020 Science Secondary School answered Ctenidia are respiratory organs 1 See answer jalaldeen361976 is waiting for your help. There are two kinds of molluscan excretory organs:brownish pericardial glands (difficult to see in most specimens) and renalnephridia or ctenidia) or molluscan gill consists of a long flattened axis hangs from the anterior wall of the mantle … While the gills are thought to serve a respiratory function, respiratory demands are low in these mostly inactive animals, and, since the body and mantle are both bathed in water, … The outer covering of the body (skin) and mantle usually act as accessory respiratory organs. Except in cephalopods, the circulatory system is open type. Based on the topography, it can be divided into five types, namely h olobranchiate, m erobranchiate, p licate, m onopectinate and b ipectinate. Your IP: 88.99.150.167 Structure: Each ctenidium (pl. Question 6. Ctenidia are respiratory organs Get the answers you need, now! Please enable Cookies and reload the page. Strictly speaking, a ctenidium is a respiratory structure that includes ciliated filaments. Books lungs are formed by invaginations of cuticle at the bases of rudimentary appendages. Another way to prevent getting this page in the future is to use Privacy Pass. A comblike structure, such as the respiratory apparatus of a mollusk or a row of spines in some insects. The respiratory current is created by lateral cilia on filaments alternately arranged on either side of the axes of the paired ctenidia. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. It is comb-like outgrowth which is located within the mantle cavity. The paired excretory organs of the mollusks are closelyassociated with the heart. In echinoderms finger-like evaginations of the coelomic cavity, the so called dermal papillae or dermal branchiae, serve as respiratory organs. Zoology. Answer. The two currents Some aquatic gastropods possess one ctenidium known as monopectinate and others have a pair of ctenidia known as bipectinate. Exceptions are the nudibranch sea slugs, whose mantle has been reduced and so have the gills, and the pulmonate snails and slugs whose gills have been reduced as an adaptation to land life and who therefore have developed a snail lung from the respiratory cavity. A comblike structure, especially a respiratory organ or gill in a mollusc, consisting of an axis with a row of projecting filaments. The respiratory organs are the gills the mantle. Add your answer and earn points. Answer: The snails' blood not only serves to transport respiratory gases and nutrients. Reduced coelom is found where on mollusca? • Completing the CAPTCHA proves you are a human and gives you temporary access to the web property. This structure exists in bivalves, cephalopods, Polyplacophorans (chitons), and in aquatic gastropods such as freshwater snail and marine snails. Answer: Locomotion is affected by tube feet. If you are at an office or shared network, you can ask the network administrator to run a scan across the network looking for misconfigured or infected devices. [New Latin, from Greek kteis, kten-, comb .] The respiratory system. The respiratory current is created by lateral cilia on filaments alternately arranged on either side of the axes of the paired ctenidia. Based … A ctenidium is a respiratory organ or gill which is found in many mollusks. Ctenidium is a respiratory organ of Mollusca. This structure exists in bivalves, cephalopods, Polyplacophorans (chitons), and in aquatic gastropods such as freshwater snail and marine snails. Lungs or pulmonary sac. Ctenidia are the respiratory organs of the following. If you are on a personal connection, like at home, you can run an anti-virus scan on your device to make sure it is not infected with malware. Answer: Respiration is through by gills, skin, buccopharynx and lungs. are solved by group of students and teacher of Class 10, which is … Performance & security by Cloudflare, Please complete the security check to access. The most obvious organs of the mantle are the paired ciliated gills or ctenidia. If you are at an office or shared network, you can ask the network administrator to run a scan across the network looking for misconfigured or infected devices. noun ctenidia. The respiratory organs consist of a pair of gills or ctenidia, one on each side, situated in the mantle cavity. Question 5. The chief respiratory organs are a pair of ctenidia and mantle. You may need to download version 2.0 now from the Chrome Web Store. There is an open circulatory system with a pumping heart, blood vessels, and blood sinuses. a (-ē-ə) Zoology. The excretory organs are clearly separated from each other and there is no connection with the pericardium. In terrestrial forms the lung develops. Are Jelly fish and star fish similar to fishes? Cloudflare Ray ID: 649166bf9e4c0089 Phylum Mollusca - The Mantle & Associated Structures -Mantle: Houses respiratory organs; Surface functions in gas exchange -Ctenidia function as countercurrent exchanger of oxygen and carbon dioxide between circulatory system and water/air -Many taxa can withdraw head into mantle cavity Only then could the food groove function during development (and evolution). These variations were once used as a basis for dividing the group into subclasses. • Your IP: 185.2.4.56 Mantle cavity houses The respiratory organs (gills or ctenidia), the openings of excretory, reproductive, and digestive organs. American Heritage® Dictionary of the English Language, Fifth Edition. Answer: The respiratory organs of amphibians are gills, lungs, skin and pharyngeal region. Ctenidium is a respiratory organ of Mollusca. How does locomotion take place in starfish? In order to quantify the absolute and relative contribution of each potential respiratory organ, we measured the surface areas of the ctenidia, as well as the IPO and OPO. D. Porifera. Correct option is . Respiration in Mollusca is provided by gills or lungs, or both. The gills are plume-shaped (Figs. Please enable Cookies and reload the page. The mantle cavity of the Mollusca is a respiratory chamber unique in its primitively posterior position and the opening into it of the alimentary, renal and reproductive systems. • The neopilinid ctenidia are considered as ventilatory rather than respiratory organs. All lamellae have vertical gill filaments which are joined by the interfilamental junctions at short intervals. • Question 6. C. Mollusca. Ctenidium — as the Respiratory Organ: Aquatic molluscs respire through ctenidia. Give reasons. Gills or ctenidia The freshwater muscle respires the oxygen dissolved in water by a pair of gills or cienidia or branchiae. 2. List the respiratory organs of amphibians. Solution: The respiratory organ of scorpion is book lung. How does locomotion take place in starfish? If you are on a personal connection, like at home, you can run an anti-virus scan on your device to make sure it is not infected with malware.
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