Ionic Mechanism of the Carbon Dioxide Reception in the Japanese House Centipede, Thereuonema hilgendorfi(Physiology)
スポンサーリンク
概要
- 論文の詳細を見る
The carbon dioxide receptor in the temporal organ of the Japanese house centipede Thereuonema hilgendorfi shows spontaneous discharges in carbon dioxide-free air. These responses are decreased or totally suppressed accompanied by a hyperpolarizing receptor potential induced by carbon dioxide stimulation. In the present study the ionic basis of the CO_2 reception has been examined by impulse analysis based upon a known linear relationship between receptor potential and impulse frequency. Even when the temporal organ was perfused with CO_2-free distilled water, receptor cells showed spontaneous discharges, and these discharges were also decreased due to perfusion of CO_2-containing solution. The spontaneous impulse frequency in the CO_2-free solution increased with increasing Na^+ and K^+ concentration, and decreased with increasing Ca^<2+> concentration. Other ions such as Mg^<2+>, Li^+, choline^+ and Cl^- had little effect on the receptor cell discharges. In the CO_2 containing perfusate, the effects of increasing Na^+ or Ca^<2+> concentration on the receptor cell discharges disappeared, whereas that of increasing K^+ concentration remained. Response amplitudes to CO_2 stimulation depended largely on Na+ and Ca^<2+> concentration, but less on K^+ concentration in the perfusate. These results suggest that Na^+ ions are major current carriers for the generation of receptor potential in response to CO_2 stimulation.
- 1998-10-15
著者
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DOI NAOMI
Department of Anatomy, Faculty of Medicine, University of the Ryukyus, Nishihara
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Toh Yoshihiro
Department Of Biology Faculty Of Science Kyushu University
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Doi N
Univ. Ryukyus Okinawa
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Yamana Kenjiro
Department Of Biology Faculty Of Science Kyushu University
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Doi Naomi
Department Of Anatomy Faculty Of Medicine University Of The Ryukyus
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