Electrical synaptic transmission from the lateral giant axon (LGN) to the giant motor axon in crayfish is strongly unidirectional... entirely because of the rectification of gap junctions at the synapse. because of the rectification of the gap junctions at the synapse, AND the HIGHER input resistance of the post-synaptic giant motor axon compared to the presynaptic axon. because of the rectification of the gap junctions at the synapse, AND the LOWER input resistance of the post-synaptic giant motor axon compared to the presynaptic axon. entirely because of the relatively LOW input resistance of the post-synaptic giant motor axon. entirely because of the relatively HIGH input resistance of the post-synaptic giant motor axon.
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Electrical synaptic transmission refers to the transfer of electrical signals between neurons through gap junctions, which are specialized protein channels that allow direct communication between cells. Show more…
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A nerve signal is transmitted along the long, thin axon of a neuron in a small fish. The transmission occurs as sodium ions (Na) transfer like tipping dominos across the axon membrane from outside to inside. Each short section of axon gets an excess of about 6 x 10 sodium ions/mm. Determine the E field 4.0 cm from the axon produced by the excess sodium ions on the inside of the axon and an equal number of negative ions on the outside of a 1-mm length of axon. The ions are separated by the 8 x 10 9 -m-thick axon membrane. Will a shark that is able to detect fields as small as 10 N/C be able to detect that axon field? Explain.
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Transmission of a nerve impulse to its target cell requires: a. endocytosis of neurotransmitters by excitatory presynaptic vesicles. b. the release of thousands of molecules of neurotransmitter stored in the postsynaptic cell into the synaptic cleft. c. $\mathrm{Ca}^{2+}$ ions to diffuse through voltage-gated $\mathrm{Ca}^{2+}$ channels. d. a fall in $\mathrm{Ca}^{2+}$ in the cytoplasm to trigger a protein that causes the presynaptic vesicle to fuse with the plasma membrane. e. an action potential to open the $\mathrm{Ca}^{2+}$ gates so that $\mathrm{Ca}^{2+}$ ions, in higher concentration outside the axon, can flow back into the cytoplasm of the neuron.
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