The Effects of Ions and Drugs on Neuro- Muscular Preparations of Sea Anemones I. on Preparations of the Column of Calliactis and Metridium
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منابع مشابه
Excitatory and inhibitory control of inherent contractions in the sea anemone Calliactis parasitica.
The shape of the column of a sea anemone depends partly on the relative state of contraction of two antagonistic muscle groups in the body wall endoderm. These muscles, the circulars and the longitudinals (parietals), are attached to the mesogloea and act against the hydrostatic pressure in the coelenteron. The circulars form a continuous muscle sheet whereas the parietals lie only where mesent...
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Coelenterates are generally assumed to be primitive animals with simple nervous systems. We believe, however, that in at least one group, the sea anemones, the nervous system is in reality rather complex, a view supported by the growing number of neuropeptides recently extracted from these animals (Grimmelikhuijzen et al. 1990a,b). Three of these peptides (Antho-RFamide and the Antho-RWamides I...
متن کاملTitle MULTIPLE CONDUCTION SYSTEMS AND THE BEHAVIOUR OF SEA ANEMONES Author(s) Mcfarlane, I. D. Citation PUBLICATIONS OF THE SETO MARINE BIOLOGICAL
Electrical activity can be recorded from three distinct conduction systems-the through-conducting nerve net and two slow systems (SSl and SS2). Spontaneous and evoked pulses are shown in recordings from M etridium senile. The responses and interactions of these systems seem to control important components of actinian behaviour. SSI pulses are seen during the opening of Tealiafe!ina in response ...
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The effect of Odonthobuthos doriae (O.d) scorpion venom at 0/3, 1 and 3, 10 µg/ml concentrations were investigated on nerve-muscle transmission, using the Twitch tension technique. A concentration of 0.3 µg/ml caused a small change in the twitch height in response to indirect muscle stimulation, but higher concentrations (1, 3, 10 µg/ml) caused a transient augmentation in twitch response follow...
متن کاملThe Pharmacological Effects of Odonthobuthus doriae Scorpion Venom and Its Extracted Fractions on Neuro-Muscular Transmission
The effect of Odonthobuthos doriae (O.d) scorpion venom at 0/3, 1 and 3, 10 µg/ml concentrations were investigated on nerve-muscle transmission, using the Twitch tension technique. A concentration of 0.3 µg/ml caused a small change in the twitch height in response to indirect muscle stimulation, but higher concentrations (1, 3, 10 µg/ml) caused a transient augmentation in twitch response follow...
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