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Which of the following is NOT a true statement? Action potentials are generated only when a neuron is depolarized beyond threshold. Action potentials are considered "all or nothing" because all action potentials that are generated in a neuron have the same amplitude. A stronger stimulation results in an increase in action potential frequency but not amplitude. Normally, action potentials are conducted unidirectionally down the axon because the period behind the action potential is in a refractory period and cannot form a new action potential The relative refractory period is a result of sodium channel inactivation. None of the above.

Which of the following is NOT a true statement? Action potentials are generated only when a neuron is depolarized beyond threshold. Action potentials are considered "all or nothing" because all action potentials that are generated in a neuron have the same amplitude. A stronger stimulation results in an increase in action potential frequency but not amplitude. Normally, action potentials are conducted unidirectionally down the axon because the period behind the action potential is in a refractory period and cannot form a new action potential The relative refractory period is a result of sodium channel inactivation. None of the above.

Human Anatomy & Physiology (11th Edition)
Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
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Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...
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QUESTION 17 Which of the following is NOT a true statement? Action potentials are generated only when a neuron is depolarized beyond threshold. Action potentials are considered "all or nothing" because all action potentials that are generated in a neuron have the same amplitude. A stronger stimulation results in an increase in action potential frequency but not amplitude. Normally, action potentials are conducted unidirectionally down the axon because the period behind the action potential is in a refractory period and cannot form a new action potential The relative refractory period is a result of sodium channel inactivation. None of the above. QUESTION 18 Indicate whether each of the following describes excitatory synapses or inhibitory synapses: neurotransmitter binding leads to influx of chloride ions through ligand-gated ion channels A. excitatory synapses ✓ use GABA as the primary neurotransmitter in the CNS B. excitatory synapses C. inhibitory synapses D. excitatory synapses use glutamate as the primary neurotransmitter in the CNS activation generates EPSPS E. inhibitory synapses ✓ have postsynaptic AMPA and NMDA receptors F. excitatory synapses depolarize the postsynaptic cell by activating neurotransmitter- gated ion channels
Transcribed Image Text:QUESTION 17 Which of the following is NOT a true statement? Action potentials are generated only when a neuron is depolarized beyond threshold. Action potentials are considered "all or nothing" because all action potentials that are generated in a neuron have the same amplitude. A stronger stimulation results in an increase in action potential frequency but not amplitude. Normally, action potentials are conducted unidirectionally down the axon because the period behind the action potential is in a refractory period and cannot form a new action potential The relative refractory period is a result of sodium channel inactivation. None of the above. QUESTION 18 Indicate whether each of the following describes excitatory synapses or inhibitory synapses: neurotransmitter binding leads to influx of chloride ions through ligand-gated ion channels A. excitatory synapses ✓ use GABA as the primary neurotransmitter in the CNS B. excitatory synapses C. inhibitory synapses D. excitatory synapses use glutamate as the primary neurotransmitter in the CNS activation generates EPSPS E. inhibitory synapses ✓ have postsynaptic AMPA and NMDA receptors F. excitatory synapses depolarize the postsynaptic cell by activating neurotransmitter- gated ion channels
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