Question

when is an action potential triggered? multiple choice when epsps exceeds ipsps when chloride channels open when ipsps exceeds epsps when potassium channels open

Explanation:

• EPSPs (Excitatory Postsynaptic Potentials) are depolarizing, promoting action potentials. IPSPs (Inhibitory Postsynaptic Potentials) are hyperpolarizing, inhibiting them. An action potential is triggered when the sum of EPSPs (excitatory influences) exceeds IPSPs (inhibitory influences), reaching the threshold.
• Opening chloride channels (option B) causes hyperpolarization (IPSP), inhibiting action potentials.
• If IPSPs exceed EPSPs (option C), the neuron is inhibited, not triggered.
• Opening potassium channels (option D, likely a typo but potassium channel opening is part of repolarization/hyperpolarization, not triggering action potentials).

Answer:

A. When EPSPs exceeds IPSPs