Characterization of the feed-back system in the heart of Helix pomatia L.

S.-Rózsa, Katalin (1972) Characterization of the feed-back system in the heart of Helix pomatia L. A Magyar Tudományos Akadémia Tihanyi Biológiai Kutatóintézetének évkönyve, 39. pp. 39-48. ISSN 0365-3005

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Abstract

The nature of the afferent signalization was studied in Helix ротайаЪ. on the preparation containing the heart and the extracardial nerve. It was found that under control conditions three types of afferent signalization differing in amplitude are running to the central nervous system through the branch of intestinal nerve innervating the heart among which two could be considered as having heart origin. If the heart is affected by tactile, pressure, osmotic or chemical stimulus afferent imputation of all-or-nothing character starts on the intestinal nerve and runs to CNS. The highest increase in frequency was observed after stimulation of tactile receptors 500 %) then according to the intensity of reactions the excitation of chemoreceptors (~ 400%), osmoreceptors 300%) and presso-receptors 200%) followed. The tactile, chemical and osmoreceptors can be categorized as slowly adapting receptors while the presso-receptors belong to those showing fast rate of adaptation. At least the presence of two different end-organs is suggested in Helix heart. The reflex areas of this heart are considered to be the analogue structures to that of the higher animal phyla.

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