Jelly-fish, star-fish and sea-urchinsD. Appleton and Company, 1898 - 323 pagini |
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Pagina 30
... half an hour or more , occasional weak and unrhythmical contractions begin to mani- fest themselves , or the contractions may even be resumed with but little apparent change in their character and frequency . The condition of the animal ...
... half an hour or more , occasional weak and unrhythmical contractions begin to mani- fest themselves , or the contractions may even be resumed with but little apparent change in their character and frequency . The condition of the animal ...
Pagina 71
... half an inch broad , it may be made more than a yard long before all the bell is used up in making the strip ; and as nothing can well be imagined as more destructive of the continuity of a nerve - plexus than this spiral mode of ...
... half an inch broad , it may be made more than a yard long before all the bell is used up in making the strip ; and as nothing can well be imagined as more destructive of the continuity of a nerve - plexus than this spiral mode of ...
Pagina 76
... half the whole distance to the terminal gang- lion , and when it reaches that ganglion it will cause it to discharge by reflex action , so giving rise to a visible wave of muscular contraction passing in the direction b a , opposite to ...
... half the whole distance to the terminal gang- lion , and when it reaches that ganglion it will cause it to discharge by reflex action , so giving rise to a visible wave of muscular contraction passing in the direction b a , opposite to ...
Pagina 82
... half inches wide with ten such cuts along each side , and the contraction - waves passing without impediment from end to end . But what I wish more especially to observe just now is , that by progressively increasing the number of such ...
... half inches wide with ten such cuts along each side , and the contraction - waves passing without impediment from end to end . But what I wish more especially to observe just now is , that by progressively increasing the number of such ...
Pagina 89
... half Time after width has been reduced to one - quarter ... Time after width has been reduced to one - eighth ... Fig . 13 . In such experiments it generally happens , as here represented , that reducing the width of a circular strip by ...
... half Time after width has been reduced to one - quarter ... Time after width has been reduced to one - eighth ... Fig . 13 . In such experiments it generally happens , as here represented , that reducing the width of a circular strip by ...
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