excitatory hreshold At an chemical synapse, activated receptors on the postsynap

Question

excitatory hreshold At an chemical synapse, activated receptors on the postsynaptic membrane are out of There are both electrical and concentration gradionts driving into the cell. Nar While for the electrical gradient opposes the concentration into gradient Opening these channels that are permeable to small positively charged ions therefore results ine samultaneous movement o, a small number of potassium ions depolarization the cell and a larger number of sodium ions the coll excitatory postsynaptic potential The net movement of ions causes a slight of the membrane This is called an , and is function is to bring the membrane potential non-solective cation channels of the postsynaplic col loser to Type here to search

Explanation / Answer

At an excitatory chemical synapse, activated receptors on the post synaptic membrane are Na+

They are both electrical and concentration gradients driving K+ into the cell.

While for non-selective cation channels, the electrical gradient opposes the concentration gradient.

Opening these channels that are permeable to small positively charged ions therefore results in the simultaneous movement of a small number of potassium ions into the cells and sodium ions out of the cell.

The net movement of ions causes a slight depolarization of the membrane.

This is called an excitatory post synaptic potential and its function is to bring the membrane potential of the post synaptic cell closer to threshold.

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