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Unformatted text preview: Guided Reading - The Nervous System: Neurons and Synapses V 1. The minimum depolarization needed to open Na + gates is called the A. repolarization. B. threshold. C. refractory period. D. All-or-none law. 2. What action produces an IPSP on the postsynaptic membrane? A. influx of Na+ ions B. opening of Ca 2+ channels into the neuron C. outflow of K+ ions D. opening of Cl- channels into the neuron 3. The binding of a neurotransmitter to its receptor protein causes ion channels to open in the post-synaptic membrane. What type of gates are these? A. chemically-regulated gates B. voltage-regulated gates C. ligand-regulated gates D. Both chemically-regulated gates and ligand-regulated gates are correct. 4. Postsynaptic inhibition is caused by neurotransmitters that produce hyperpolarization. True False 5. What amino acid are dopamine, norepinephrine, and epinephrine derived from? A. histidine B. tyrosine C. tryptophan D. serine 6. What neurotransmitter is used by neurons with cell bodies in the raphe nuclei along the midline of the 6....
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- Fall '11