Reflex influences on the activity of adductors of fresh-water mussel (Anodonta cygnea L.) by stimuli applied to the heart

Salánki, János and Pécsi, Tibor (1965) Reflex influences on the activity of adductors of fresh-water mussel (Anodonta cygnea L.) by stimuli applied to the heart. A Magyar Tudományos Akadémia Tihanyi Biológiai Kutatóintézetének évkönyve, 32. pp. 93-109. ISSN 0365-3005

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Abstract

The responses of the anterior and posterior adductors of fresh water mussel to various stimuli were investigated. In the course of the experiment chemical (5-HT,tryptamine, ACh and KCl) mechanical and electric stimuli were applied. The followings were established: 1. The local stimulation of the heart produces reactions not only on the heart itself, but influences also simultaneously the activity of the adductors. The effect on the adductors manifests itself in the activation of the mechanism of relaxation if the adductors are in tonic contraction. If, however, the adductors are in the condition of relaxation and show rhythmic activity at the application of the stimulus, then after some initial contraction' increased relaxation takes place or there is a return to the original rhythm. Most pronounced relaxing effect was observable on the application of 5-HT to the heart. 2. When the activities of the two adductors were recorded separately it was observed, that the relaxation of the posterior adductor took place in general earlier than that of the anterior one. This implies, in contradiction to published data, that the central nervous elements responsible for the relaxation of adductors are not exclusively located in the cerebral ganglia. 3. The area of the heart is the receptor zone of the adductors and a close reflex relationship exists between the heart and the adductors.

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