The action potential and nervous conduction
نویسندگان
چکیده
منابع مشابه
Action Potential Initiation and Conduction in Axons
Transmission of electrical signals in biological systems operates under constraints imposed by thematerials used to build the conducting pathways. The conduction medium in nerves is a membrane-enclosed dilute salt solution rather than a metal wire, for example, as in macroscopic physical systems. Axons have been compared for decades to undersea cables that are surrounded by saltwater.However, t...
متن کاملAction-potential modulation during axonal conduction.
Once initiated near the soma, an action potential (AP) is thought to propagate autoregeneratively and distribute uniformly over axonal arbors. We challenge this classic view by showing that APs are subject to waveform modulation while they travel down axons. Using fluorescent patch-clamp pipettes, we recorded APs from axon branches of hippocampal CA3 pyramidal neurons ex vivo. The waveforms of ...
متن کاملThe Different Mechanisms of Action Potential Propagation in the Heart
It was thought previously that cardiac muscle gap junctions provide low-resistance connections between cells and permit the local-circuit current to flow. Some evidences show that myocardial cells may not require low-resistance connections for successful propagation of the action potential (AP). It seems that some other types of mechanisms must be involved in AP propagation. In this article, we...
متن کاملThe Different Mechanisms of Action Potential Propagation in the Heart
It was thought previously that cardiac muscle gap junctions provide low-resistance connections between cells and permit the local-circuit current to flow. Some evidences show that myocardial cells may not require low-resistance connections for successful propagation of the action potential (AP). It seems that some other types of mechanisms must be involved in AP propagation. In this article, we...
متن کاملOn the Theory of Nervous Conduction
Assuming that the propagation of the nervous impulse consists in the excitation of adjacent regions of the nerve by the action current of the already excited region, exact equations for the velocity of such a propagation are established and integrated. The result depends on the assumptions which we make about the laws of excitation. If Hoorweg's law is accepted, it is found that the velocity of...
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ژورنال
عنوان ژورنال: Surgery (Oxford)
سال: 2010
ISSN: 0263-9319
DOI: 10.1016/j.mpsur.2009.12.001