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- W2178304161 abstract "This chapter discusses the physiology of ascidians of Ciona intestinalis, Phallwia mammillata or Ascidia nigra. It presents a comparative study of the architecture of the ascidian test and examines its functional significance. The ascidian test is an outer protective covering which completely surrounds the individual zooid in solitary ascidians or forms a common groundwork in which the zooids are embedded in colonial species. Details of fine structure and the intervention of morula cells in the deposition of complex polysaccharide microfibrils are provided. Different groups of ascidians have tests of different organization varying from gelatinous to fibrous. The chapter elucidates the fine structure and function of the ascidian test, and the type of secretion which it produces. It describes the functional significance of differences in branchial organization and how it relates to food collection. It is suggested that different ascidians are exploiting different fractions of the food supply available in the environment. Ascidians are entirely ammonotelic in their nitrogen metabolism but store products of nucleic acid metabolism as urates or higher purines. The simplicity of life in ascidians is matched by the apparent simplicity of their nervous system. Ascidian nerves are unresponsive to normal nerve stains and they are difficult to trace. The primary role of the nervous system is in the maintenance of the water current; thatseems to be achieved through vincercll control of the branchial cilia and somatic control of siphons and mantle." @default.
- W2178304161 created "2016-06-24" @default.
- W2178304161 creator A5086336827 @default.
- W2178304161 date "1975-01-01" @default.
- W2178304161 modified "2023-10-16" @default.
- W2178304161 title "The Physiology of Ascidians" @default.
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