Synaptic Transmission
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20 questions
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- Q1All of the following are functions of gap junctions in the nervous tissue except:Couple neuronsAllow for chemical synapse connectionsControl of capillary bedsEnsure cells that are coupled develop synchronously30s
- Q2When comparing chemical neurotransmission to electrical neurotransmission, chemical is all of the following except:Less reliableSlowerLess subject to toxinsAllows for more complex information processing30s
- Q3What is the correct sequence of chemical neurotransmission?Synthesis of vesicles to Depolarization to Opening of Ca++ channels to release of neurotransmitterSynthesis of vesicles to Opening of Ca++ channels to Depolarization to release of neurotransmitterDepolarization to opening of Ca++ channels to synthesis of vesicles to release of neurotransmitterNone of the above30s
- Q4Why are neuropeptides not usually recycled back into the presynaptic terminal?Their polarity is too high compared to the terminal so they are pushed awayThey need to be synthesized in the cell body regardlessThis is false, neuropeptides are indeed recycled.They are too big to fit through the recycling receptors30s
- Q5Inactivated products of neurotransmitters can be taken up by a process of endocytosis.TRUEFALSE30s
- Q6Which of the following is not a characteristic of metabotropic synapses?Activate enzymatic processUse of second messengersDoes not lead to the opening of ion channelsSlow synapses30s
- Q7What is the main advantage of second messengers in the transduction system?It can stimulate multiple events in the cell simultaneously.It can produce postsynaptic effects that other receptors cannotIt is a much faster processIt does not require energy30s
- Q8The prevalent excitatory transmitter in the central nervous system is ________ and the primary inhibitory neurotransmitter in the brain is __________?Glutamate; AcetylcholineGABA; glutamateGlycine, GABAGlutamate; GABA30s
- Q9The neurotransmitter serotonin is broken down by what?Catechol-O-methyl transferaseMonoamine oxidaseSerotonin is not broken down since it is not recycled back into the presynaptic terminalAcetylcholinesterase30s
- Q10Which neurotransmitter is associated with sleep/wake cycles and the maintenance of a conscious state?GlutamateSubstance PGABAHistamine30s
- Q11The most common type of electrical synapses are what?ConnectionsEphaptic connectionsGap junctionsElectrotonic synapses30s
- Q12Myelin sheath, primarily in the PNS, may be affected by which hereditary disease that leads to demyelination, slowing of conduction velocity, and muscle weakness?Charcot-Marie-Tooth diseaseHydrocephalyArnold Chiari malformationLack of arachnoid granulations30s
- Q13Which of the following neurotransmitters, produced by the golgi apparatus, is least likely to be recycled?Substance PAcetylcholineBiogenic aminesPurines30s
- Q14Blockage of which voltage gated channel will prevent the release of vesicles in the presynaptic terminal?Cl-O+AcetylcholineCa++30s
- Q15All of the following may remove or reuptake neurotransmitters from the synaptic cleft EXCEPT which?Transporter proteinsPost synaptic receptorsAstrocytesVesicles via endocytosis30s