The Correct answer for this question is Potassium ions.
What is an inhibitory postsynaptic potential (IPSP)?
The opening of chloride channels, on the other hand, causes an inhibitory postsynaptic potential, or IPSP. Because chloride has an equilibrium potential of -65 mV, when chloride channels open at -60 mV, electrochemical gradients drive chloride into the cell. Chloride introduces a negative charge into the cell, causing the membrane potential of the cell to become more negative, or hyperpolarize. This is referred to as hyperpolarization because the cell's membrane potential shifts away from 0 mV and the membrane becomes more polarized. An IPSP reduces the likelihood of a neuron firing an action potential, making this ion flow inhibitory.
Therefore, an IPSP is an inhibitory change in the membrane potential of a postsynaptic neuron.
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