Question

Inhibitory postsynaptic potentials (IPSPs )

A) result in local depolarizations.
B) result in local hyperpolarizations.
C) increase membrane permeability to sodium ions.
D) prevent the escape of potassium ions.
E) prevent the escape of calcium ions.

Answer 1

IPSPs result in hyperpolarizations of the postsynaptic membrane, making it less likely for a neuron to fire an action potential.

Step-by-step explanation:

Inhibitory postsynaptic potentials (IPSPs) result in local hyperpolarizations of the postsynaptic membrane. When neurotransmitters like GABA (gamma-aminobutyric acid) bind to the receptors on the synaptic cleft, they typically open Cl- channels, allowing Cl- ions to flow into the neuron. This influx leads to hyperpolarization, making the neuron less likely to fire an action potential.