An EPSP
A)is a direct result of the opening of ligand-gated channels permeable to both Na⁺ and K⁺ ions.
B)is a direct result of the opening of voltage-gated channels permeable to both Na⁺ and K⁺ ions.
C)stabilizes the membrane to remain at its resting potential.
D)opens voltage-gated Ca²⁺ channels in the presynaptic membrane.
E)occurs when voltage-gated Cl⁻ channels open in a postsynaptic cell membrane.

Question

An EPSP
A)is a direct result of the opening of ligand-gated channels permeable to both Na⁺ and K⁺ ions.
B)is a direct result of the opening of voltage-gated channels permeable to both Na⁺ and K⁺ ions.
C)stabilizes the membrane to remain at its resting potential.
D)opens voltage-gated Ca²⁺ channels in the presynaptic membrane.
E)occurs when voltage-gated Cl⁻ channels open in a postsynaptic cell membrane.

Quizplus · Accepted Answer

An EPSP or excitatory postsynaptic potential is a result of the opening of ligand-gated channels, also called ionotropic receptors, which are permeable to both Na⁺ and K⁺ ions. This influx of positive ions leads to depolarization of the postsynaptic membrane, bringing it closer to the threshold potential for action potential generation.