In a simple synapse, neurotransmitter chemicals are released by ______ Select one: A. the presynaptic membrane B. ducts on the smooth endoplasmic reticulum C. axon hillocks D. cell bodies
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- Neurotransmitters must pass from an axon terminal to the next dendrite by crossing a fluid-filled space called the a. synapse. c. neuron. b. reuptake inhibitor. d. glial cell.Synaptic transmission is inhibited by all the following, except :-a- oxygen lackb- alkalosisc- acidosisd- prolonged activity of synapseAt a given synapse, the _____ neuron has neurotransmitter receptors.
- Synaptic transmission depends upon :- a-direct transmission of impulses from the presynaptic neuron to the postsynaptic neuronb- diffusion of neurotransmitters from synaptic knobs into the soma and dendrites of postsynaptic neuronsc- presence of voltage-gated Ca ++ channels in membrane of synaptic knobsd- presence of voltage-gated Ca ++ channels in the subsynaptic membraneWhich of these is least likely to trigger an action potential in a post-synaptic cell? A)EPSPs and IPSPs arrive simultaneously at multiple synapses. B)The other choices are equally likely to trigger an action potential. C)Single EPSPs arrive simultaneously at multiple synapses. D)Multiple EPSPs arrive rapidly at a single synapse.Which of the following is the most direct result of depolarizingthe presynaptic membrane of an axon terminal?(A) Voltage-gated calcium channels in the membrane open.(B) Synaptic vesicles fuse with the membrane.(C) Ligand-gated channels open, allowing neurotransmittersto enter the synaptic cleft.(D) An EPSP or IPSP is generated in the postsynaptic cell.
- In chemical synapses, transmission occurs in a forward direction because :-a- neurotransmitter receptors are found only in the postsynaptic membraneb- the subsynaptic membrane does not contain neurotransmitter vesiclesc- the subsynaptic membrane is more sensitive than the membrane of synaptic knob to the effect of neurotransmittersd- the subsynaptic membrane contains both ligand-gated and voltage-gated ionic channelsWhen a postsynaptic neuron is adequately stimulated, action potentials develop at the initial segment of the axon because :-a- it contains many voltage-gated Na + channelsb- it contains the highest concentration of ligand-gated cation channelsc- it contains many voltage-gated Ca ++ channelsd- it is more sensitive to the direct stimulant effect of neurotransmittersA synapse with all of these; a postsynaptic dendrite, an astrocyte end foot, and the presynaptic terminal button/bouton is called..... A. synaptic convergence B. engulfment synapse C. tripartite synapse D. receptor confluence synapse E. astrocytic engulfment
- Presynaptic inhibition depends upon :-a- augmented release of chemical transmitter from presynaptic terminalsb- continued depolarization of presynaptic terminalsc- GABA receptors in presynaptic terminalsd- opening of voltage-gated Ca ++ channels in presynaptic terminalsTwo excitatory synapses on a neuron fire at the same time as one inhibitory neuron. Each synapse comes from a different presynaptic neuron. Explain what happens at each synapse (in the post-synaptic neuron) and what determines whether this neuron will fire.A/An _____ synapse is formed when a presynaptic neuron synapses with the cell body of a postsynaptic neuron
