Jelly-fish, star-fish and sea-urchinsD. Appleton and Company, 1898 - 323 pagini |
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Pagina 25
... wave of contraction , and of nerve - fibres as conveying an invisible , or molecular , wave of stimulation . Nerve - fibres , then , are functionally distinguished from muscle - fibres— and also from protoplasm - by displaying the pro ...
... wave of contraction , and of nerve - fibres as conveying an invisible , or molecular , wave of stimulation . Nerve - fibres , then , are functionally distinguished from muscle - fibres— and also from protoplasm - by displaying the pro ...
Pagina 48
... wave . If these shocks are thrown in at a somewhat fast rate , two contraction waves may be made at the same time to course along the spiral * See " Croonian Lectures , " 1875. Philosophical Transactions , vol . 166 , part I. pp . 284-6 ...
... wave . If these shocks are thrown in at a somewhat fast rate , two contraction waves may be made at the same time to course along the spiral * See " Croonian Lectures , " 1875. Philosophical Transactions , vol . 166 , part I. pp . 284-6 ...
Pagina 49
... wave mounts upon its predecessor ; and if several waves be thus made to coalesce , the whole strip becomes thrown into a state of persistent contraction . In this way sustained tetanus , or single con- traction waves , or any ...
... wave mounts upon its predecessor ; and if several waves be thus made to coalesce , the whole strip becomes thrown into a state of persistent contraction . In this way sustained tetanus , or single con- traction waves , or any ...
Pagina 57
... wave of the former process must always precede that of the latter . But , on the other hand , in this connection it is of the first importance to remember the fact already stated , viz . that a current which at the be- ginning of a ...
... wave of the former process must always precede that of the latter . But , on the other hand , in this connection it is of the first importance to remember the fact already stated , viz . that a current which at the be- ginning of a ...
Pagina 68
... wave . Yet this is not the case ; for even in a specimen of Aurelia so severely cut as the one here represented , the contraction waves , starting from the ganglion , continued to zigzag round and round the entire series of sections ...
... wave . Yet this is not the case ; for even in a specimen of Aurelia so severely cut as the one here represented , the contraction waves , starting from the ganglion , continued to zigzag round and round the entire series of sections ...
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