Jelly-fish, star-fish and sea-urchinsD. Appleton and Company, 1898 - 323 pagini |
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Pagina 68
George John Romanes. contraction waves which now originate from the ganglion must either become blocked and cease to pass round the disc , or they must zigzag round and round the tops of these overlapping cuts . Now , remembering that ...
George John Romanes. contraction waves which now originate from the ganglion must either become blocked and cease to pass round the disc , or they must zigzag round and round the tops of these overlapping cuts . Now , remembering that ...
Pagina 72
... blocked when the contractile strip is only an inch long , while in other cases ( as in the one represented ) the wave will continue to pass through a strip more than thirty times that length ; and between these two extremes there are ...
... blocked when the contractile strip is only an inch long , while in other cases ( as in the one represented ) the wave will continue to pass through a strip more than thirty times that length ; and between these two extremes there are ...
Pagina 73
... blocked , the blocking is sure to take place completely and exclusively at that point . Now , as I have tried this experiment a great number of times , and always tried it by carefully feeling the way round ( ie . only making a very ...
... blocked , the blocking is sure to take place completely and exclusively at that point . Now , as I have tried this experiment a great number of times , and always tried it by carefully feeling the way round ( ie . only making a very ...
Pagina 74
... blocked by the severity of a spiral or other form of section , it may again be made to force a passage under the influence of vagus stimulation . Moreover , in a paper still more recently published by Drs . Brunton and Cash on ...
... blocked by the severity of a spiral or other form of section , it may again be made to force a passage under the influence of vagus stimulation . Moreover , in a paper still more recently published by Drs . Brunton and Cash on ...
Pagina 80
... blocked , if the section be stopped at this point it not unfrequently happens that after a time the blocking suddenly ceases , the contraction - waves again passing from the strip into the umbrella as freely as they did before the ...
... blocked , if the section be stopped at this point it not unfrequently happens that after a time the blocking suddenly ceases , the contraction - waves again passing from the strip into the umbrella as freely as they did before 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