PROLONGED ACTION POTENTIALS FROM SINGLE NODES OF RANVIER
نویسندگان
چکیده
منابع مشابه
Prolonged Action Potentials from Single Nodes of Ranvier
The duration of action potentials from single nodes of Ranvier can be increased by several methods. Extraction of water from the node (e.g. by 2 to 3 M glycerin) causes increased durations up to 1000 msec. 1 to 5 min. after application of the glycerin the duration of the action potential again decreases to the normal value. Another type of prolonged action potential can be observed in solutions...
متن کاملAfter-Potentials and Large Depolarizations of Single Nodes of Ranvier Treated with Veratridine
Potential differences between normal nodes of Ranvier (single fiber from the sciatic nerve of the frog, air-gap method) and a node exposed to 1 to 2.5 x 10(-6) gm veratridine per ml were measured. Negative after-potentials occurred immediately after application of the alkaloid when spike configuration and resting potential were virtually unchanged. The after-potentials decreased in magnitude an...
متن کاملA New Measurement of Action Currents Developed by Single Nodes of Ranvier.
THE SALTATORY THEORY OF NERVOUS CONDUCTION in the myelinated nerve fiber is based on the following experimental evidence: 1) electric excitation takes place only at nodes of Ranvier, 2) action potential is produced only at nodes, and 3) the local current resulting from excitation of a node is strong enough to excite the neighboring node. The major portion of the evidence mentioned above was pub...
متن کاملSome Effects of Calcium Ions on the Action Potential of Single Nodes of Ranvier WERNER
Action potentials of single frog nerve fibers were recorded with the air-gap method in "low Ca" (0.26 mM) and "high Ca" (4.2 mm) solutions and compared to spikes in normal Ringer's (1.05 mM Ca). On increasing (Ca), the action potentials became shorter, the "knee" during the falling phase as well as the threshold for abolition moved to internal potentials more positive, and the spike recovery du...
متن کاملSome Effects of Calcium Ions on the Action Potential of Single Nodes of Ranvier
Action potentials of single frog nerve fibers were recorded with the air-gap method in "low Ca" (0.26 mM) and "high Ca" (4.2 mM) solutions and compared to spikes in normal Ringer's (1.05 mM Ca). On increasing (Ca)(o) the action potentials became shorter, the "knee" during the falling phase as well as the threshold for abolition moved to internal potentials more positive, and the spike recovery ...
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ژورنال
عنوان ژورنال: Journal of General Physiology
سال: 1958
ISSN: 1540-7748,0022-1295
DOI: 10.1085/jgp.42.1.137