7. Describe a chemical synapses. 8. What are leak channels? What are chemically (ligand) gated channels? What are voltage-gated channels? Which ion channel opens in response to a change in membrane potential and participates in the generation and conduction of an action potentials? A) mechanically gated channel B) ligand-gated channel C) leakage channel D) voltage-gated channel
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Step 1: Chemical synapses are intercellular junctions between neurons or neurons and muscles where neurotransmitter signals are released, such as glutamate. Show more…
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Ligand-gated ion channels play important roles in relaying information between neurons at synapses. An outline of the structure of a synapse is shown in this diagram. Which of the following statements most accurately describes ligand-gated ion channels found at synapses? A) The neurotransmitter ligand binds and opens the channel, and then the ligand-gated ion channel directly regulates ion flow into the cell receiving the neurotransmitters. B) The neurotransmitter ligand binds and opens the channel, and then the ligand-gated ion channel directly regulates ion flow into the cell releasing the neurotransmitters. C) The neurotransmitter ligand binds and either opens or closes the channel, and then the ligand-gated ion channel directly regulates ion flow into the cell releasing the neurotransmitters. D) The neurotransmitter ligand binds and either opens or closes the channel, and then the ligand-gated ion channel directly regulates ion flow into the cell receiving the neurotransmitters.
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Identify the following as properties of electrical synapses (ES), chemical synapses (CS), or both (B). a. _____ The plasma membranes of presynaptic and postsynaptic neurons are joined by gap junctions. b. _____ Transmission is unidirectional and delayed. c. _____ A presynaptic neuron and a postsynaptic neuron are involved. d. _____ The use of neurotransmitters packaged into synaptic vesicles is required. e. _____ Transmission is nearly instantaneous and bidirectional.
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In a chemical synapse, the axon terminal of the presynaptic neuron contains ___, while the membrane of the postsynaptic neuron contains ___ A) synaptic vesicles; voltage-gated channels B) voltage-gated channels; synaptic vesicles C) ligand-gated channels; synaptic vesicles D) voltage-gated channels; ligand-gated channels
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