Axons found around the area indicated by the arrow in the figure above are myelinated by A. astrocytes B. dorsal root ganglion cells C. microglia D. oligodendrocytes E. Schwann cells
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- Ganglia are ... a) ... collections of nerve cell bodies outside the CNS b) ... part of a nerve cell c) ... the connection between two nerve cells d) ... collections of nerve fibers in the CNS e) ... a type of glial cells in the brainCells found in the choroid plexuses that secrete cerebrospinalfluid area. astrocytes. d. oligodendrocytes.b. microglia. e. Schwann cells.c. ependymal cellsWhy are certain cells in the entorhinal cortex called grid cells?A. They respond to locations distributed in a hexagonal grid.B. They have axons that spread out in the shape of a grid.C. They have dendrites that spread out in the shape of a grid.D. They respond when an animal sees something shaped like a grid.
- The myelin sheath is produced around axons in the PNS by (a) ganglia (b) neuron cell bodies (c) dendrites (d) Schwann cells (e) oligodendrocytesWhich of these do dendritic spines do?A. They synthesize proteins.B. They increase the surface area available for synapses.C. They hold the neuron in position.D. They metabolize fuels to provide energy for the rest of the neuron.Neurotransmitters are released by_____ . a. axon terminals c. dendrites b. a neuron cell body d. glial cells
- Choose the right one : < > stimuli will activate the somatic corpuscular first order neurons. A. <Temerature> B, <Light physical pressure> C, <Noxious> D, <Strong physical pressure> E, <Vibration>What do multiple sclerosis and ALS (amyotropic lateral sclerosis) have in common?a. They both are more common in young men than in young women.b. They both impair the initiation of action potentials.c. They both damage the myelin sheath, disrupting action potential transmission.d. They both impair nerve function in the peripheral nervous systemWhich of the following is a direct target of the vestibular ganglion? a. superior colliculus b. cerebellum c. thalamus d. optic chiasm
- At maximal stimulation, much above threshold, how long will it be until an axon fires the next AP? A.The absolute refractory period B.The relative refractory period C.The absolute and relative refractory periodsThe central nervous system is connected with the peripheral nervous system by all the following types of nerve fibers, except :-a- postganglionic autonomic fibersb- preganglionic autonomic fibersc- somatic motor fibersd- autonomic sensory fibersThe effects of sympathetic and parasympathetic fibers are cooperative ina. the heart.b. the reproductive system.c. the digestive system.d. the eyes.