A) ? Absolute refractory period Depolarisation phase of action potential Failed generator potentials Hyperpolarisation Relative refractory period Repolarisation phase of action potential Resting potential Resting potential regained Threshold potential Voltage gated potassium channels close Voltage gated potassium channels open Voltage gated sodium channels close Voltage gated sodium channels open B) ? Absolute refractory period Depolarisation phase of action potential Failed generator potentials Hyperpolarisation Relative refractory period Repolarisation phase of action potential Resting potential Resting potential regained Threshold potential Voltage gated potassium channels close Voltage gated potassium channels open Voltage gated sodium channels close Voltage gated sodium channels open C) ? Absolute refractory period Depolarisation phase of action potential Failed generator potentials Hyperpolarisation Relative refractory period Repolarisation phase of action potential Resting potential Resting potential regained Threshold potential Voltage gated potassium channels close Voltage gated potassium channels open Voltage gated sodium channels close Voltage gated sodium channels open D) ? Absolute refractory period Depolarisation phase of action potential Failed generator potentials Hyperpolarisation Relative refractory period Repolarisation phase of action potential Resting potential Resting potential regained Threshold potential Voltage gated potassium channels close Voltage gated potassium channels open Voltage gated sodium channels close Voltage gated sodium channels open E) ? Absolute refractory period Depolarisation phase of action potential Failed generator potentials Hyperpolarisation Relative refractory period Repolarisation phase of action potential Resting potential Resting potential regained Threshold potential Voltage gated potassium channels close Voltage gated potassium channels open Voltage gated sodium channels close Voltage gated sodium channels open F) ? Absolute refractory period Depolarisation phase of action potential Failed generator potentials Hyperpolarisation Relative refractory period Repolarisation phase of action potential Resting potential Resting potential regained Threshold potential Voltage gated potassium channels close Voltage gated potassium channels open Voltage gated sodium channels close Voltage gated sodium channels open G) ? Absolute refractory period Depolarisation phase of action potential Failed generator potentials Hyperpolarisation Relative refractory period Repolarisation phase of action potential Resting potential Resting potential regained Threshold potential Voltage gated potassium channels close Voltage gated potassium channels open Voltage gated sodium channels close Voltage gated sodium channels open