An inhibitory postsynaptic potential A)Is produced by an increased permeability to both Na⁺ and K⁺ B)Is produced by an increased permeability to Cl^- and/or K⁺ C)Is a small depolarization in a postsynaptic cell D)Can be summed with other IPSPs to trigger an action potential in the postsynaptic cell E)Both is produced by an increased permeability to both Na⁺ and K⁺ and can be summed with other IPSPs to trigger an action potential in the postsynaptic cell are correct

Question

Quizplus · Accepted Answer

An inhibitory postsynaptic potential (IPSP) is produced by an increased permeability to either Cl- or K+. This causes hyperpolarization (i.e. the membrane potential becomes more negative), making it less likely that an action potential will be triggered in the postsynaptic cell. Additionally, IPSPs cannot be summed to trigger an action potential because they move the membrane potential further away from the threshold for firing an action potential.

An Inhibitory Postsynaptic Potential