BIOS252 Week 6 Lab - Synapse

These are referred to as epsps because of the

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These are referred to as EPSPs because of the location of the electrical impulses. 14. Opening Cl - or K + channels on the postsynaptic membrane will generate hyperpolarizations. Explain why these are referred to as Inhibitory Postsynaptic Membrane Potentials ( IPSPs ). These are referring to ISPs because an ionic flow causes the inside of the cell to make it less positive and makes it more difficult to reach the threshold and generate an action potientail. 15. What influence do EPSPs and IPSPs have on whether or not an action potential will be generated at a neuron’s trigger zone? Depolarize the threshold
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Summation 16. Postsynaptic membrane potentials are summed (combined) and integrated at a neuron’s trigger zone. These membrane potentials come from thousands of synapses from the neuron’s dendrites. a. Define spatial summation . The consequence of the summings up of all the electrical impulses from many different synapses at the neurons trigger zone at the same time. b. Define temporal summation . The effect of multiple impulses coming from one synapse over a period of time. 17. IPSPs and EPSPs can combine to produce three possible outcomes. Describe what happens with each of the following. a. Hyperpolarization The membrane becomes more polarized an action potiental does not generate b. Sub-threshold graded potential The membrane depolarizes and does the reach threshold and also there is not action potiental c. Threshold graded potential An action potential is generated.
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