Extracellular K+ and Ca2+ activities measured during the action of negative pressure under a suction electrode placed on the surface of frog heart ventricle
Jazyk angličtina Země Česko Médium print
Typ dokumentu časopisecké články
PubMed
2931734
Knihovny.cz E-zdroje
- MeSH
- akční potenciály MeSH
- decerebrační rigidita MeSH
- draslík fyziologie MeSH
- elektrody MeSH
- extracelulární prostor fyziologie MeSH
- membránové potenciály MeSH
- odsávání * MeSH
- Rana temporaria MeSH
- reakční čas MeSH
- srdce fyziologie MeSH
- srdeční komory MeSH
- vápník fyziologie MeSH
- zvířata MeSH
- Check Tag
- zvířata MeSH
- Publikační typ
- časopisecké články MeSH
- Názvy látek
- draslík MeSH
- vápník MeSH
The application of negative pressure of -40 kPa (-300 mm Hg) for 10 min under a suction electrode placed on the surface of the spontaneously beating frog ventricle changed the extracellular potassium activity (aoK+) in three phases: a phase of rapidly rising aoK+, a slowly decaying phase and a phase of slowly rising aoK+. The changes reversed when suction was discontinued during the rapidly rising and decaying phase, but were not reversed during the slowly rising phase. Calcium extra-cellular activity (aoCa2+) decreased between -5 and -13 kPa, but increased during the higher pressures. The results indicated that injury of the ventricular tissue caused by a suction electrode elevated aoK+ and altered aoCa2+.
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