Jelly-fish, star-fish and sea-urchinsD. Appleton and Company, 1898 - 323 pagini |
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Pagina 23
... mean by the term " excitability . " Suppose that a * " Die Medusen physiologisch und morphologisch auf ihr Nervensystem untersucht " ( Tübingen , 1878 ) . muscle has been cut from the body of a freshly STRUCTURE OF THE MEDUSE . 23.
... mean by the term " excitability . " Suppose that a * " Die Medusen physiologisch und morphologisch auf ihr Nervensystem untersucht " ( Tübingen , 1878 ) . muscle has been cut from the body of a freshly STRUCTURE OF THE MEDUSE . 23.
Pagina 24
... means of a pinch , a burn , an electrical shock , or a chemical irritant , the muscle will give a single contraction in response to every stimulation . And it is this readiness of organic tissues to respond to a suitable stimulus that ...
... means of a pinch , a burn , an electrical shock , or a chemical irritant , the muscle will give a single contraction in response to every stimulation . And it is this readiness of organic tissues to respond to a suitable stimulus that ...
Pagina 41
... means of a dark lantern and a concentrating lens , I then cast a beam of light through the water in which the Sarsia were swimming . The effect upon the latter was most decided . From all parts of the bell - jar they crowded into the ...
... means of a dark lantern and a concentrating lens , I then cast a beam of light through the water in which the Sarsia were swimming . The effect upon the latter was most decided . From all parts of the bell - jar they crowded into the ...
Pagina 44
... means the time after the occurrence of an excitation during which a series of physiolo- gical processes are taking place , which terminate in a contrac- tion ; so that , whether the excitation is of a strong or of a weak intensity , the ...
... means the time after the occurrence of an excitation during which a series of physiolo- gical processes are taking place , which terminate in a contrac- tion ; so that , whether the excitation is of a strong or of a weak intensity , the ...
Pagina 50
... means of a pair of compasses thrust through it and forced into a piece of wood , which was fastened to the bottom of the basin . The legs of the com- * * It may here be stated that in all the experiments on stimu- lation subsequently to ...
... means of a pair of compasses thrust through it and forced into a piece of wood , which was fastened to the bottom of the basin . The legs of the com- * * It may here be stated that in all the experiments on stimu- lation subsequently to ...
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