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 -90mV. 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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Signal transmission from one neuron to another requires a series of processes pertaining to different components of each neuron. What happens at the axon terminals to facilitate signal transmission to another neuron? a. Chemicals released at the axon terminals transmit signals through synapses into other neurons via the second neuron’s dendrites. b. Chemicals released at the axon terminals transmit signals through synapses into other neurons via the second neuron’s axons. c. Chemicals released at the dendrites transmit signals through synapses into other neurons via the second neuron’s axon terminal. d. Chemicals released at the axon terminals transmit signals directly into other neurons via the second neuron’s axons.
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A post-synaptic neuron (A) receives input from two tonically active, pre-synaptic neurons (B) and (C). These synapses are on different parts of the post-synaptic membrane but are the same distance from the axon hillock. Input from (B) alone can result in an action potential in (A), but input from (C) alone cannot. What best explains this outcome? a) The time interval between subsequent action potentials in neuron (B) is longer than that in neuron (C). b) The resting membrane potential at the synapse with (B) is more negative than the resting membrane potential at the synapse with (C). c) Neuron (B) releases inhibitory neurotransmitter whereas neuron (C) releases excitatory neurotransmitter. d) The time interval between subsequent action potentials in neuron (B) is shorter than that in neuron (C).
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