Jelly-fish, star-fish and sea-urchinsD. Appleton and Company, 1898 - 323 pagini |
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Pagina 48
... tion of nerve - tissues under the influence of the constant current , which is known to physiologists by the term " electrotonus ; " but it would be some- what tedious to detail the evidence on this head which I have already published ...
... tion of nerve - tissues under the influence of the constant current , which is known to physiologists by the term " electrotonus ; " but it would be some- what tedious to detail the evidence on this head which I have already published ...
Pagina 52
... the cylinder from b to c being known . Summation of Stimuli . - In this way I have been able to ascertain the period of latent stimula- tion in Aurelia aurita with accuracy . It must be 52 JELLY - FISH , STAR - FISH , AND SEA - URCHINS .
... the cylinder from b to c being known . Summation of Stimuli . - In this way I have been able to ascertain the period of latent stimula- tion in Aurelia aurita with accuracy . It must be 52 JELLY - FISH , STAR - FISH , AND SEA - URCHINS .
Pagina 53
... tion will be comparatively feeble with a very long period of latency , viz . five - eighths of a second . If another shock of the same intensity be thrown in as soon as the tissue has relaxed , a somewhat stronger contraction , with a ...
... tion will be comparatively feeble with a very long period of latency , viz . five - eighths of a second . If another shock of the same intensity be thrown in as soon as the tissue has relaxed , a somewhat stronger contraction , with a ...
Pagina 59
... tion , whether of a natural or artificial kind , is supplied to the excitable tissues of a jelly - fish , a short period , called the period of latency , will elapse , and then the jelly - fish will give a single weak contraction . If ...
... tion , whether of a natural or artificial kind , is supplied to the excitable tissues of a jelly - fish , a short period , called the period of latency , will elapse , and then the jelly - fish will give a single weak contraction . If ...
Pagina 60
... tion accumulates to a point at which it becomes impossible to avoid coughing . And similarly with tickling generally , the convulsive reflex movements to which it gives rise become more and more incon- trollable the longer the ...
... tion accumulates to a point at which it becomes impossible to avoid coughing . And similarly with tickling generally , the convulsive reflex movements to which it gives rise become more and more incon- trollable the longer 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