Electric discharge of electrocytes: Modelling, analysis and simulation.

Area of Science:

• Biophysics
• Computational Neuroscience
• Electrophysiology

Background:

• Electrocytes generate electric potential through ion transport.
• Previous models often simplified electrocyte behavior, assuming open circuits.

Purpose of the Study:

• To develop a comprehensive model for electrocyte electric discharge.
• To investigate the impact of finite resistance on electric potential and action potential generation.

Main Methods:

• Formulation of a single electrocyte-resistor unit using a Poisson-Nernst-Planck (PNP) system.
• Asymptotic analysis to simplify the PNP system into an ordinary differential equation (ODE) based model.
• Numerical simulations to analyze model behavior under finite resistance conditions.

Main Results:

• Finite electric current generation leading to non-constant intracellular and extracellular potentials.
• Induction of an additional action potential (AP) at the non-innervated membrane.
• Identification of internal resistance due to mobile ions as the cause of voltage drop within the electrocyte.

Conclusions:

• The developed single-cell model accurately captures complex electrocyte discharge dynamics.
• The model provides a basis for simulating stacked electrocyte systems, enabling estimation of electric eel discharge currents.