Jelly-fish, star-fish and sea-urchinsD. Appleton and Company, 1898 - 323 pagini |
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Pagina 25
... action , we infer that ganglia are probably present . Lastly , another important distinction must be borne in mind - the distinction , namely , which is to be drawn between muscle and nerve . A stimulus applied to a nerveless muscle can ...
... action , we infer that ganglia are probably present . Lastly , another important distinction must be borne in mind - the distinction , namely , which is to be drawn between muscle and nerve . A stimulus applied to a nerveless muscle can ...
Pagina 39
... action of light as a stimulus is most marked and unfailing . In the case of Sarsia , for instance , a flash of light let fall upon a living specimen almost invariably causes it to respond with one or more contractions . If the animal is ...
... action of light as a stimulus is most marked and unfailing . In the case of Sarsia , for instance , a flash of light let fall upon a living specimen almost invariably causes it to respond with one or more contractions . If the animal is ...
Pagina 46
... action of light upon the ganglionic matter of this Medusa we have some analogy to its action on certain chemical compounds in this respect , that , just as in the case of those compounds which light is able to split up , a more or less ...
... action of light upon the ganglionic matter of this Medusa we have some analogy to its action on certain chemical compounds in this respect , that , just as in the case of those compounds which light is able to split up , a more or less ...
Pagina 56
... action , two questions naturally present themselves . In the first place , we are anxious to know whether the arousing effect which is so conspicuous in a stair- case series is due to the occurrence of the previous stimulations , or to ...
... action , two questions naturally present themselves . In the first place , we are anxious to know whether the arousing effect which is so conspicuous in a stair- case series is due to the occurrence of the previous stimulations , or to ...
Pagina 58
... action admits of being very prettily shown in another way . If a tolerably large Aurelia is cut into a spiral strip of small width and great length , and if all the lithocysts are removed except one at one end of the strip , it may be ...
... action admits of being very prettily shown in another way . If a tolerably large Aurelia is cut into a spiral strip of small width and great length , and if all the lithocysts are removed except one at one end of the strip , it may be ...
Termeni și expresii frecvente
able ambulacral feet artificial rhythm Aurelia aurita become bell blocked brium cause ceased chloroform co-ordination continue contractile strip contractile tissue contraction contraction-waves covered-eyed Medusa crawling curare diastole direction discharge Echinoderm Echinodermata Echinus effect excising excitable tissues experiments fact feeble fibres forceps fresh water function ganglionic glycerine hour Illustrations induction shocks influence instance intervals irritability jelly-fish latter lithocyst locomotor centres manubrium marginal bodies marginal ganglia minutes movements muscle muscular mutilated naked-eyed Medusa natural rhythm nectocalyx nerve nerve-cells nerve-centre nerve-fibres nerve-ring nerve-trunks nervous network nervous system normal sea-water observed occur organ paralyzed pass pedicellariæ pedicels period of latent physiological plexus poison portion prepotent Professor pulsations radial tubes rays reflex reflex action removed response Sarsia seconds segments spasm species specimens spines spontaneity Star-fish strychnia suckers surface swimming motions swimming-bell systole tank temperature tentacles tentacular tetanus Tiaropsis indicans tion umbrella unmutilated animal wave whole