Read e-book online A Functional Biology of Scyphozoa PDF

By Mary N. Arai (auth.)

ISBN-10: 9400914970

ISBN-13: 9789400914971

ISBN-10: 9401071691

ISBN-13: 9789401071697

Scyphozoa have attracted the eye of many sorts of individuals. Naturalists watch their swish locomotion. Fishermen could dread the swarms which could hinder fishing or consume larval fish. Bathers retreat from the water in the event that they are stung. humans from a few Asiatic nations consume the medusae. Comparative physiologists learn them as probably uncomplicated types for the functioning of assorted platforms. This publication integrates facts from these and different investigations right into a sensible biology of scyphozoa. it's going to emphasize the wide variety of adaptive responses attainable in those morphologically quite basic animals. The e-book will pay attention to the study of the final 35 years, in part simply because there was a fast growth of data in the course of that interval, and in part simply because a lot of the former paintings was once summarized via books released among 1961 and 1970. Bibliographies of papers on scyphozoa have been integrated in Mayer (1910) and Kramp (1961). Taxonomic diagnoses also are integrated in these monographs, in addition to in a monograph at the scyphomedusae of the USSR released by way of Naumov (Naumov, 1961). such a lot impor­ tantly, a genenttion of scyphozoan employees has used as its 'bible' the monograph via F.S.Russell (1970) The Medusae of the British Isles. regardless of its restrictive name, his ebook studies lots of the info at the biology of scyphozoa as much as that date.

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3). 6 Transmitters In higher animals transmission between neurons is due to movement of chemical transmitters across a synaptic cleft between the cells, or to electrical coupling via gap junctions. In the latter case, cell interiors are directly linked by aqueous channels through gap junctional particles, allowing movement of compounds (including experimental dyes) between the two cells. Gap junctions have been identified in hydrozoa where they form the basis for epithelial conduction.

Perkins et al. (1971) examined Chrysaora quinquecirrha fishing tentacle muscle contracted, or relaxed to 7-20 times or to 30 times the Muscle 25 contracted length. 5 nm). e. not in fully contracted or fully relaxed muscle. Both of these observations are very interesting and should be verified. The possibility that thick filaments contract as well as slide past thin filaments in muscles of higher phyla is very controversial (Pollack, 1990). It is also unclear what the function may be of an extra filament type only present at intermediate muscle lengths.

Each of these organs includes a complex of sensory structures. There is always a club-like body, the rhopalium, with a terminal solid statocyst and an associated hood, which is sensitive to the position of the medusa. Information from each marginal sense organ is transferred to an associated marginal centre of the nervous system, and thence to the nerve nets. There may 'also be ocelli associated with the marginal sense organs which are sensitive to light. Functionally these responses of the marginal sense organs to light and gravity are best known.

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A Functional Biology of Scyphozoa by Mary N. Arai (auth.)

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