Axon hillock Select the area of the chart below that represents the change in membrane potential at the axon hillock caused by the synapse labeled A- (1 mark) Threshold 1 1 Time Select the area of the chart below that represents the change in membrane potential at the axon hillock caused by the synapse labeled B- (1 mark) Threshold 1 Select the area of the chart below that represents the change in membrane potential at the axon hillock caused by the synapse labeled C+ (1 mark) Threshold 1
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Describe what occurs at the neuronal synapse when the action potential reaches the axon terminal of the presynaptic neuron and a following EPSP. Use the following terms in your diagram or description: Depolarization, voltage gated calcium channel, axon, axon terminal, presynaptic membrane, post-synaptic membrane, synaptic cleft, vesicle, exocytosis, neurotransmitter, nonspecific cation channel.
Adi S.
Table 3: Change in Membrane Potential From Axon Hillock to Axon Values of Maximal Depolarization of Membrane Potential (mV) at Different Stimulation Voltages, by Location Stimulation Voltage 0V (resting membrane potential) 2V 4V 6V 8V Axon Hillock -68.4 -64.1 -56.6 31.4 31.3 Axon -69 -73 -65 31.9 30.9 Action Potential Generation Action potential generated? no no no yes yes Change in membrane potential with distance 0.6 8.9 8.4 -0.5 0.4
Sri K.
Axon terminals from several different neurons synapse onto a single neuron. Some of these presynaptic neurons are sending excitatory signals, while others are sending inhibitory signals. Over the course of the effects of these signals, the postsynaptic membrane potential reaches around -90 mV. What is the overall effect on the postsynaptic neuron? Multiple Choice The postsynaptic neuron is excited enough to easily cross threshold and generate an action potential. The postsynaptic neuron is inhibited from generating action potentials. The postsynaptic neuron is excited, but not enough to cross threshold. The postsynaptic neuron is stabilized and remains at its resting potential.
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