Experimental Physiology
HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
QUICK SEARCH:   [advanced]


     

Quarterly Journal of Experimental Physiology 69.2 pp 235-243
© The Physiological Society 1984
This Article
Right arrow Full Text (PDF)
Right arrow Alert me when this article is cited
Right arrow Alert me if a correction is posted
Services
Right arrow Email this article to a friend
Right arrow Similar articles in this journal
Right arrow Similar articles in PubMed
Right arrow Alert me to new issues of the journal
Right arrow Download to citation manager
Citing Articles
Right arrow Citing Articles via Google Scholar
Google Scholar
Right arrow Articles by Luxoro, M.
Right arrow Articles by Nassar-Gentina, V.
Right arrow Search for Related Content
PubMed
Right arrow PubMed Citation
Right arrow Articles by Luxoro, M.
Right arrow Articles by Nassar-Gentina, V.

POTASSIUM-INDUCED DEPOLARIZATIONS AND GENERATION OF TENSION IN BARNACLE MUSCLE FIBRES: EFFECTS OF EXTERNAL CALCIUM, STRONTIUM AND BARIUM

M. Luxoro 1 and Verónica Nassar-Gentina 2

1 Laboratorio de Fisiologia Celular, Facultad de Ciencias, Universidad de Chile, Casilla 657, Viña del Mar, Chile
2 Departamento de Fisiologáa y Biofísica, Facultad de Medicina, Universidad de Chile, Santiago

Potassium-induced contractions were studied in muscle fibres from Megabalanus psittacus (Darwin) in an attempt to establish the requirement of extracellular calcium for the development of force. A sudden elevation of external potassium induced the production of contractures and/or twitches only if calcium was present. In calcium-free solutions no contraction or action potential occurred. When external calcium was replaced by barium, potassium-induced depolarizations accompanied by several action potentials did not generate either contractures or twitches. With strontium in place of calcium, action potentials of different duration were observed. Only the long-lasting ones (a few seconds) induced twitches.

Submitted on March 9, 1983






HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
Copyright © 1984 by the The Physiological Society.