Jelly-fish, star-fish and sea-urchinsD. Appleton and Company, 1898 - 323 pagini |
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Pagina 44
... strong or of a weak intensity , the period of latent stimulation is not much affected . The above question , therefore , was simply this - Does the pro- longed delay on the part of these ganglia , in responding to light , interesting ...
... strong or of a weak intensity , the period of latent stimulation is not much affected . The above question , therefore , was simply this - Does the pro- longed delay on the part of these ganglia , in responding to light , interesting ...
Pagina 48
... strong faradization does cause a more or less well - pro- nounced tetanus . The continuity of the spasm is , indeed , often interrupted by momentary and partial relaxations . These interruptions are the more fre- quent the weaker the ...
... strong faradization does cause a more or less well - pro- nounced tetanus . The continuity of the spasm is , indeed , often interrupted by momentary and partial relaxations . These interruptions are the more fre- quent the weaker the ...
Pagina 73
... strong evidence that the passage of the contraction - waves is dependent on the functional activity of the nervous plexus , and therefore that they are not merely muscle- waves , is furnished by the fact that at whatever point in a ...
... strong evidence that the passage of the contraction - waves is dependent on the functional activity of the nervous plexus , and therefore that they are not merely muscle- waves , is furnished by the fact that at whatever point in a ...
Pagina 80
... strong currents , and also by the fact that the saline tissues of the swimming - bell must short - circuit any feeble electrical currents as soon as they are generated . down . The first wave which effects a passage appears 80 JELLY ...
... strong currents , and also by the fact that the saline tissues of the swimming - bell must short - circuit any feeble electrical currents as soon as they are generated . down . The first wave which effects a passage appears 80 JELLY ...
Pagina 98
... strong to do this . Accordingly I chose a specimen of Aurelia wherein the occurrence of tentacular waves was very conspicuous , and found , as I had hoped , that every time I stimulated too gently to start a con- traction - wave , the ...
... strong to do this . Accordingly I chose a specimen of Aurelia wherein the occurrence of tentacular waves was very conspicuous , and found , as I had hoped , that every time I stimulated too gently to start a con- traction - wave , the ...
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