© 2018 Pearson Education, Inc.

What part of a neuron carries an excitatory signal toward the neuron cell body? Axon Neurofilaments Dendrite Telodendria Answer: c © 2018 Pearson Education, Inc.

What part of a neuron carries an excitatory signal toward the neuron cell body? Axon Neurofilaments Dendrite Telodendria © 2018 Pearson Education, Inc.

What type of neuron composes most of the sensory neurons found only in the PNS? Anaxonic Bipolar Multipolar Unipolar Answer: d © 2018 Pearson Education, Inc.

What type of neuron composes most of the sensory neurons found only in the PNS? Anaxonic Bipolar Multipolar Unipolar © 2018 Pearson Education, Inc.

Which of these monitor the position and movement of torso, head, and limbs? Exteroceptors Visceroceptors Proprioceptors Somatic effectors Answer: c © 2018 Pearson Education, Inc.

Which of these monitor the position and movement of torso, head, and limbs? Exteroceptors Visceroceptors Proprioceptors Somatic effectors © 2018 Pearson Education, Inc.

To which division of the nervous system does the sympathetic nervous system belong? Autonomic nervous system Central nervous system Visceral sensory Somatic nervous system Answer: a © 2018 Pearson Education, Inc.

To which division of the nervous system does the sympathetic nervous system belong? Autonomic nervous system Central nervous system Visceral sensory Somatic nervous system © 2018 Pearson Education, Inc.

Which of the following best explains why nerve regeneration is limited in the CNS? Ependymal cells attack damaged neurons. Oligodendrocytes cannot reproduce myelin. Microglia produce toxins that destroy myelin. Astrocytes release chemicals that block regrowth of axons. Answer: d © 2018 Pearson Education, Inc.

Which of the following best explains why nerve regeneration is limited in the CNS? Ependymal cells attack damaged neurons. Oligodendrocytes cannot reproduce myelin. Microglia produce toxins that destroy myelin. Astrocytes release chemicals that block regrowth of axons. © 2018 Pearson Education, Inc.

Which of these are open in an undisturbed cell? Sodium-gated channels Potassium-gated channels Potassium leak channels Chloride-gated channels Answer: c © 2018 Pearson Education, Inc.

Which of these are open in an undisturbed cell? Sodium-gated channels Potassium-gated channels Potassium leak channels Chloride-gated channels © 2018 Pearson Education, Inc.

What term is used to describe a transmembrane potential in which the electrical and chemical gradients are equal and opposite with no net ion movement? Action potential Graded potential Excitatory postsynaptic potential Equilibrium potential Answer: d © 2018 Pearson Education, Inc.

What term is used to describe a transmembrane potential in which the electrical and chemical gradients are equal and opposite with no net ion movement? Action potential Graded potential Excitatory postsynaptic potential Equilibrium potential © 2018 Pearson Education, Inc.

What type of channel involves the binding of acetylcholine to a receptor? Chemically gated Voltage-gated Mechanically gated Calcium-gated Answer: a © 2018 Pearson Education, Inc.

What type of channel involves the binding of acetylcholine to a receptor? Chemically gated Voltage-gated Mechanically gated Calcium-gated © 2018 Pearson Education, Inc.

Which of these is NOT characteristic of a graded potential? Involves chemical or mechanical gates Can occur along the dendrites Can be weak or strong Is always excitatory Answer: d © 2018 Pearson Education, Inc.

Which of these is NOT characteristic of a graded potential? Involves chemical or mechanical gates Can occur along the dendrites Can be weak or strong Is always excitatory © 2018 Pearson Education, Inc.

On which part of a neuron will you most likely find voltage-gated calcium channels? Soma Axon Dendrites Axon terminals Answer: d © 2018 Pearson Education, Inc.

On which part of a neuron will you most likely find voltage-gated calcium channels? Soma Axon Dendrites Axon terminals © 2018 Pearson Education, Inc.

Which step occurs first in the generation of an action potential? Chemically gated sodium channels open Voltage-gated sodium channels open Voltage-gated sodium channels close Potassium channels open Answer: b © 2018 Pearson Education, Inc.

Which step occurs first in the generation of an action potential? Chemically gated sodium channels open Voltage-gated sodium channels open Voltage-gated sodium channels close Potassium channels open © 2018 Pearson Education, Inc.

Axoplasmic transport is responsible for _____. when the axon reaches threshold delivery of an action potential down the axon delivery of neurotransmitters to axon terminals when the axon hyperpolarizes Answer: c © 2018 Pearson Education, Inc.

Axoplasmic transport is responsible for _____. when the axon reaches threshold delivery of an action potential down the axon delivery of neurotransmitters to axon terminals when the axon hyperpolarizes © 2018 Pearson Education, Inc.

With which of the following is saltatory propagation associated? Absolute refractory period Relative refractory period Myelinated axons Graded potentials Answer: c © 2018 Pearson Education, Inc.

With which of the following is saltatory propagation associated? Absolute refractory period Relative refractory period Myelinated axons Graded potentials © 2018 Pearson Education, Inc.

Which area of a myelinated axon has the greatest concentration of available voltage-gated channels? Dendritic spines Axonal internodes Axonal nodes Synaptic knobs Answer: c © 2018 Pearson Education, Inc.

Which area of a myelinated axon has the greatest concentration of available voltage-gated channels? Dendritic spines Axonal internodes Axonal nodes Synaptic knobs © 2018 Pearson Education, Inc.

If a stimulus created a membrane potential of –40 mV during the absolute refractory period, which of the following would occur? A second action potential begins A series of action potentials occurs The action potential ends normally Sodium inactivation gates open Answer: c © 2018 Pearson Education, Inc.

If a stimulus created a membrane potential of –40 mV during the absolute refractory period, which of the following would occur? A second action potential begins A series of action potentials occurs The action potential ends normally Sodium inactivation gates open © 2018 Pearson Education, Inc.

What is the function of calcium in the production of an action potential? Release of acetylcholine Opening of chemically gated sodium channels Inactivation of potassium channels Return of neuron to resting state Answer: a © 2018 Pearson Education, Inc.

What is the function of calcium in the production of an action potential? Release of acetylcholine Opening of chemically gated sodium channels Inactivation of potassium channels Return of neuron to resting state © 2018 Pearson Education, Inc.

Which of these will end synaptic fatigue? Higher frequency of action potentials Acetylcholinesterase activity Replenishing synaptic vesicles Opening Ca2+ gates Answer: c © 2018 Pearson Education, Inc.

Which of these will end synaptic fatigue? Higher frequency of action potentials Acetylcholinesterase activity Replenishing synaptic vesicles Opening Ca2+ gates © 2018 Pearson Education, Inc.

Which of these will eliminate synaptic delay? Increasing ATP availability Increasing postsynaptic receptors Using an electrical synapse Providing more vesicles Answer: c © 2018 Pearson Education, Inc.

Which of these will eliminate synaptic delay? Increasing ATP availability Increasing postsynaptic receptors Using an electrical synapse Providing more vesicles © 2018 Pearson Education, Inc.

Which of these is a component of an electrical synapse? Voltage-gated channels Gap junctions Tight junctions Neurotransmitter Answer: b © 2018 Pearson Education, Inc.

Which of these is a component of an electrical synapse? Voltage-gated channels Gap junctions Tight junctions Neurotransmitter © 2018 Pearson Education, Inc.

What would be the effect of exposure to a toxic substance that inhibits the activity of acetylcholinesterase? Extended depolarization of neurons Reduced depolarization of neurons Hyperpolarization of neurons Inability to reach threshold Answer: a © 2018 Pearson Education, Inc.

What would be the effect of exposure to a toxic substance that inhibits the activity of acetylcholinesterase? Extended depolarization of neurons Reduced depolarization of neurons Hyperpolarization of neurons Inability to reach threshold © 2018 Pearson Education, Inc.

Which of the following events might lead to an inhibitory postsynaptic potential? Opening of potassium channels Opening of sodium channels Closing of sodium channels Opening of calcium channels Answer: a © 2018 Pearson Education, Inc.

Which of the following events might lead to an inhibitory postsynaptic potential? Opening of potassium channels Opening of sodium channels Closing of sodium channels Opening of calcium channels © 2018 Pearson Education, Inc.

Which of these occurs when a series of EPSPs reaches a postsynaptic cell, bringing it to threshold? Hyperpolarization Temporal summation Spatial summation Facilitation Answer: b © 2018 Pearson Education, Inc.

Which of these occurs when a series of EPSPs reaches a postsynaptic cell, bringing it to threshold? Hyperpolarization Temporal summation Spatial summation Facilitation © 2018 Pearson Education, Inc.

Which of these describes spatial summation? Multiple action potentials are produced on the target cell’s axon Action potentials arrive at the target cell from more than one synapse Facilitation combined with inhibition Stimulation during refractory period Answer: b © 2018 Pearson Education, Inc.

Which of these describes spatial summation? Multiple action potentials are produced on the target cell’s axon Action potentials arrive at the target cell from more than one synapse Facilitation combined with inhibition Stimulation during refractory period © 2018 Pearson Education, Inc.

What covers most of the surface of the soma and dendrites of a multipolar neuron? Myelin sheath Astrocyte processes Neurilemma Synaptic knobs Answer: d © 2018 Pearson Education, Inc.

What covers most of the surface of the soma and dendrites of a multipolar neuron? Myelin sheath Astrocyte processes Neurilemma Synaptic knobs © 2018 Pearson Education, Inc.

With a resting potential of –70 mV and a threshold of –60 mV, which of the following is a likely result of facilitation? –95 mV +30 mV –67 mV –55 mV Answer: c © 2018 Pearson Education, Inc.

With a resting potential of –70 mV and a threshold of –60 mV, which of the following is a likely result of facilitation? –95 mV +30 mV –67 mV –55 mV © 2018 Pearson Education, Inc.

Which of these neurotransmitters generates IPSPs on postsynaptic neurons? GABA Glutamate Serotonin Epinephrine Answer: a © 2018 Pearson Education, Inc.

Which of these neurotransmitters generates IPSPs on postsynaptic neurons? GABA Glutamate Serotonin Epinephrine © 2018 Pearson Education, Inc.