Jelly-fish, star-fish and sea-urchinsD. Appleton and Company, 1898 - 323 pagini |
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Pagina 7
... response to stimulation than is the case with the animals which we are about to consider . And if any one should go so far as to object to Mr. Darwin's experiments on these plants on account of its not being demonstrable that the ...
... response to stimulation than is the case with the animals which we are about to consider . And if any one should go so far as to object to Mr. Darwin's experiments on these plants on account of its not being demonstrable that the ...
Pagina 24
... response to every stimulation . And it is this readiness of organic tissues to respond to a suitable stimulus that physiologists designate by the term " excitability . " Nerves , no less than muscles , present the pro- perty of being ...
... response to every stimulation . And it is this readiness of organic tissues to respond to a suitable stimulus that physiologists designate by the term " excitability . " Nerves , no less than muscles , present the pro- perty of being ...
Pagina 37
... response to every nip with the forceps . The contraction is precisely similar to the ordinary ones that are per- formed by the unmutilated animal ; so that by repeating the stimulus a number of times , the nectocalyx , with its centres ...
... response to every nip with the forceps . The contraction is precisely similar to the ordinary ones that are per- formed by the unmutilated animal ; so that by repeating the stimulus a number of times , the nectocalyx , with its centres ...
Pagina 38
... response to thermal stimulation , from the fact that while these tissues are not nearly so sensitive to this mode of excitation as might be anticipated , they are , as just observed , extraordi- narily sensitive to mechanical excitation ...
... response to thermal stimulation , from the fact that while these tissues are not nearly so sensitive to this mode of excitation as might be anticipated , they are , as just observed , extraordi- narily sensitive to mechanical excitation ...
Pagina 39
... response to every flash . There can thus be no doubt that a sudden transi- tion from darkness to light acts upon Sarsia as a stimulus , and this even though the transition be but of momentary duration . The question there- fore arises ...
... response to every flash . There can thus be no doubt that a sudden transi- tion from darkness to light acts upon Sarsia as a stimulus , and this even though the transition be but of momentary duration . The question there- fore arises ...
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