Human Anatomy and Physiology 1 PEARSON Quiz 12 – Flashcards
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What is occurring at the area labeled #4?
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Excessive potassium has diffused out causing hyperpolarization. Submit
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________ are the most numerous type of neuron in the CNS.
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Interneurons
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________ nerves are nerves that connect to the brain.
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Cranial
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________ line the brain ventricles and spinal canal.
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Ependymal cells
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Which area of the graph shows when chemically gated sodium channels are open?
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1
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Puffer fish poison blocks voltage-gated sodium channels like a cork. What effect would this neurotoxin have on the function of neurons?
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The axon would be unable to generate action potentials.
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________ monitor the position of skeletal muscles and joints.
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Proprioceptors
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The ion that triggers the release of acetylcholine into the synaptic cleft is
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calcium
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The most abundant class of neuron in the central nervous system is
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multipolar
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At the normal resting membrane potential of a typical neuron, its sodium-potassium exchange pump transports
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3 intracellular sodium ions for 2 extracellular potassium ions.
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A shift of the resting transmembrane potential toward 0 mV is called
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depolarization
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Clusters of RER and free ribosomes in neurons are called
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Nissl bodies.
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The ________ division of the peripheral nervous system brings sensory information to the central nervous system.
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afferent
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The myelin sheath that covers many CNS axons is formed by
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oligodendrocytes.
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The all-or-none principle states that
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all stimuli great enough to bring the membrane to threshold will produce identical action potentials.
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The ________ nervous system controls the skeletal muscles.
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somatic
