EFFECT OF CALCIUM ON THE SPONTANEOUS ACTIVITIES OF THE OYSTER MYOCARDIUM IN SODIUM FREE SOLUTION
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The oyster heart muscle can continue to develop spike potential rhythmically in a solution where practically all Na ions were removed and replaced by isosmolar Tris. Tetrodotoxin did not show any appreciable effect on both contraction and excitation at the concentration of 5×10-7g/ml. The application of 10mM manganese ion caused the frequency to increase, but after 30 minutes the rhythmical contraction stopped at a diastole with a concomitant cessation in electrical activity. The amplitude and maximum rate of rise of spike potential which developed in Na+ free solution increased as the concentration of Ca++ in the solution was elevated and decreased when it was reduced. A tenfold increase in [Ca++] 0 elevated the amplitude of the spike potential by approximately 19mV. This indicates that Ca++ can also play a dominant role in the generation of spikes in the bivalve heart muscle.
収録刊行物
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- The Japanese Journal of Physiology
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The Japanese Journal of Physiology 18 (2), 157-168, 1968
一般社団法人 日本生理学会
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詳細情報 詳細情報について
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- CRID
- 1390282680018187904
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- NII論文ID
- 40018684083
- 130003476132
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- NII書誌ID
- AA00691224
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- COI
- 1:CAS:528:DyaF1cXktFOiu7c%3D
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- ISSN
- 18811396
- 0021521X
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- NDL書誌ID
- 8508050
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- PubMed
- 5302357
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- 本文言語コード
- en
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- データソース種別
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- JaLC
- NDL
- Crossref
- PubMed
- CiNii Articles
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- 使用不可