Jelly-fish, star-fish and sea-urchinsD. Appleton and Company, 1898 - 323 pagini |
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Pagina 24
... contraction in 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 ...
... contraction in 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 ...
Pagina 25
... contraction , which spreads in all directions from the seat of disturbance as from a A nerve , on the other hand , conducts the stimulus without sensibly moving or undergoing any change of shape . Now , in order not to forget this ...
... contraction , which spreads in all directions from the seat of disturbance as from a A nerve , on the other hand , conducts the stimulus without sensibly moving or undergoing any change of shape . Now , in order not to forget this ...
Pagina 26
... contraction and relaxation of the entire muscular sheet which lines the cavity of the bell . At each contraction of this muscular sheet the gelatinous walls of the bell are drawn together ; the capacity.
... contraction and relaxation of the entire muscular sheet which lines the cavity of the bell . At each contraction of this muscular sheet the gelatinous walls of the bell are drawn together ; the capacity.
Pagina 28
... contractions with a vigour and a pertinacity not in the least impaired by its severance from the main organism , so that the contrast between the perfectly motionless swimming - bell and the active contractions of the thread - like ...
... contractions with a vigour and a pertinacity not in the least impaired by its severance from the main organism , so that the contrast between the perfectly motionless swimming - bell and the active contractions of the thread - like ...
Pagina 29
... contraction . Indeed , if only the tiniest piece of contractile tissue be left adhering to a single mar- ginal body cut out of the bell of Sarsia , this tiny piece of tissue , in this isolated state , will continue its contractions for ...
... contraction . Indeed , if only the tiniest piece of contractile tissue be left adhering to a single mar- ginal body cut out of the bell of Sarsia , this tiny piece of tissue , in this isolated state , will continue its contractions for ...
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