Cytology of the Nervous System
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16 questions
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- Q1Which neuroglial cells myelinate axons in the CNS?Ependymal cellsSchwann cellsOliodendrocytesAstrocytes30s
- Q2Which of the following is not true of the perikaryon?Can have direct synaptic connections with other neuronsContain the cell nucleusCan be stained with dyes that bind nucleic acidsThey have a small amount of rough endoplasmic reticulum30s
- Q3Where in the receptor zone of the neuron is all received electrical input averaged together to potentially produce an action potential?Cell nucleusInitial segmentAxon hillockSoma30s
- Q4The larger the diameter of an axon, the faster the signal conduction.TRUEFALSE30s
- Q5All of the following is true of nodes of Ranvier except:They are myelinatedThey are separated in regular intervals on the axon.They have many ion channels involved in action potential conductionThey are areas of depolarization30s
- Q6What can you assume from an axon that is not myelinatedAxon conduction velocity will be fasterAxon conduction velocity will be slowerThe action potential will now “jump” across the axonNothing, conduction will be the same30s
- Q7Which two cells are responsible to regulating the extracellular synaptic environment in the central nervous system?Oligodendrocytes and ependymal cellsSchwann and satellite cellsAstrocytes and oligodendrocytesAstrocytes and satellite cells30s
- Q8All of the following are examples of astrocyte functions except:Assist in the migration of neurons to their appropriate locations during developmentContribute to the blood brain barrierAssist in neurotransmitter recyclingThey help return potassium to the extracellular environment30s
- Q9What type of cell moves between the peripheral nervous system and central nervous system to assist in injury or infection?AstrocytesMicroglial cellsSatellite cellsPeripheral macrophages30s
- Q10How are astrocytes connected to one another?Tight junctionsDesmosomesAdherens junctionsGap junctions30s
- Q11Sensory neurons that bring information from the body into the spinal cord are commonly what type or neuron?PseudounipolarMultipolarUnipolarBipolar30s
- Q12Olfactory epithelial cells are an example of what type of neuron?PseudounipolarUnipolarBipolarMultipolar30s
- Q13The averaging of graded potentials occurs in which area of the neuron?DendritesTerminal endAxon HillockInitial Segment30s
- Q14An autoimmune disease that causes demyelination may yield all of the following EXCEPT which?Inability to fire an action potentialDecline in the control of ionic environment of the axonInhibition of saltatory conductionDecreased in conduction velocity30s
- Q15Which of the following is NOT a function of astrocytes?Scavenge for Na+ in the extracellular environmentHelp form the blood brain barrierSupply nutrients to neurons from circulationInactivate neurotransmitters in the synaptic cleft30s