QUESTION 11 When an action potential reaches the axon terminal, most neurons release a chemical, called a neurotransmitter. Which of the following statements regarding this process is INCORRECT? A. Ca2+ influx into the axon terminal results in fusion of the membranes of the synaptic vesicle and the neuronal cell membrane B. Ca2+ influx into the axon terminal occurs by active transport of Ca2+ ions against its concentration gradient across the cell membrane C. The process by which neurotransmitter release occurs from the axon terminal is exocytosis D. An action potential reaching the axon terminal causes the opening of voltage-gated Ca2+ channels E. Neurotransmitters are stored in synaptic vesicles in the axon terminal of the neuron
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The process by which neurotransmitter release occurs from the axon terminal is exocytosis. Show more…
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Choose the incorrect statement: a. Neurotransmitters diffuse across the myelin sheath. b. In an inhibitory synapse, the neurotransmitter makes it less likely that an action potential will be generated in the postsynaptic (after the synapse) neuron. c. Neurotransmitters are stored in synaptic vesicles. d. Most interneurons are found in the central nervous system.
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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