Answer: Differential equations with m, h (Na+ channel gating) and n (K+ channel gating) variables derived from voltage-clamp experiments.
- A Mainly a simple, fixed-threshold equation that includes few voltage-dependent gating variables present in general practice
- B Differential equations with m, h (Na+ channel gating) and n (K+ channel gating) variables derived from voltage-clamp experiments
- C Ohm's law alone, relating membrane current directly to voltage and a fixed resistance term value as frequently described in most textbook accounts
- D The Nernst equation alone, describing mainly the equilibrium potential of a single permeant ion species during normal conditions
Correct answer: B. Differential equations with m, h (Na+ channel gating) and n (K+ channel gating) variables derived from voltage-clamp experiments
Explanation: Hodgkin-Huxley model (1952 Nobel Prize): conductance-based equations using m<sup>3h</sup> (Na+ activation/inactivation) and n<sup>4</sup> (K+ activation) variables, accurately reproducing action potential shape and propagation.
Structure of a neuron. Image: LadyofHats (Mariana Ruiz), Public Domain, via Wikimedia Commons.
Concept context
Brain, spinal cord, neurons, reflex arcs, and sense organs.