Question 1

A 31-year-old woman is diagnosed with depression and prescribed a selective serotonin reuptake inhibitor. Which of the following is a precursor of serotonin?

Accepted Answer

A)  Lysine 
B)  Glutamine 
C)  Tryptophan 
D)  Histidine 
E)  Threonine 
A)  Lysine 
B)  Glutamine 
C)  Tryptophan 
D)  Histidine 
E)  Threonine C

Question 2

Which of the following most accurately represents the order of events for transmission at a G-protein coupled receptor?

Accepted Answer

A)  Activation of a G-protein, binding of the neurotransmitter, activation of the effector 
B)  Binding of the effector, binding of the neurotransmitter, activation of a G-protein 
C)  Binding of the neurotransmitter, activation of a G-protein, activation of the effector 
D)  Activation of the effector, binding of the neurotransmitter, activation of a G-protein 
E)  Binding of a G-protein, binding of the neurotransmitter, activation of the effector 
A)  Activation of a G-protein, binding of the neurotransmitter, activation of the effector 
B)  Binding of the effector, binding of the neurotransmitter, activation of a G-protein 
C)  Binding of the neurotransmitter, activation of a G-protein, activation of the effector 
D)  Activation of the effector, binding of the neurotransmitter, activation of a G-protein 
E)  Binding of a G-protein, binding of the neurotransmitter, activation of the effector C

Question 3

Connections to the globus pallidus from the putamen are an example of an inhibitory synapse in the central nervous system that utilizes which of the following neurotransmitters?

Accepted Answer

A)  Glutamate 
B)  Gamma-aminobutyric acid 
C)  Diacylglycerol 
D)  Adenylyl cyclase 
E)  Enkephalin 
A)  Glutamate 
B)  Gamma-aminobutyric acid 
C)  Diacylglycerol 
D)  Adenylyl cyclase 
E)  Enkephalin B

Question 4

Which of the following factors influences the conduction velocity of the action potential through the axon?

Accepted Answer

A)  Axon diameter 
B)  Myelin thickness 
C)  Ion channel density 
D)  All of the above 
A)  Axon diameter 
B)  Myelin thickness 
C)  Ion channel density 
D)  All of the above

Question 5

The stimulus intensity required to initiate an action potential is referred to as which of the following?

Accepted Answer

A)  Saturation 
B)  Threshold 
C)  Adaptation 
D)  Frequency coding 
E)  Refractory period 
A)  Saturation 
B)  Threshold 
C)  Adaptation 
D)  Frequency coding 
E)  Refractory period

Question 6

In the normal axon, reverse propagation of the action potential is not possible because the membrane is

Accepted Answer

A)  Refractory because of sodium channel inactivation 
B)  Refractory owing to potassium channel inactivation 
C)  Refractory as a result of sodium ion influx 
D)  Refractory because of potassium ion influx 
E)  At its resting potential 
A)  Refractory because of sodium channel inactivation 
B)  Refractory owing to potassium channel inactivation 
C)  Refractory as a result of sodium ion influx 
D)  Refractory because of potassium ion influx 
E)  At its resting potential

Question 7

The undershoot of the action potential is primarily attributable to which of the following?

Accepted Answer

A)  Sodium influx 
B)  Sodium efflux 
C)  Potassium influx 
D)  Potassium efflux 
A)  Sodium influx 
B)  Sodium efflux 
C)  Potassium influx 
D)  Potassium efflux

Question 8

High concentrations of acetylcholine maintained at the neuromuscular junction for several seconds would result in which of the following?

Accepted Answer

A)  Desensitization 
B)  Hyperexcitation 
C)  Inhibition 
D)  Saturation 
E)  Recruitment 
A)  Desensitization 
B)  Hyperexcitation 
C)  Inhibition 
D)  Saturation 
E)  Recruitment

Question 9

Which of the following is considered the rate-limiting step in the synthesis of acetylcholine?

Accepted Answer

A)  Transport of choline into the neuron 
B)  Acetylcholinesterase production 
C)  Choline acetyltransferase activity 
D)  Acetyl CoA availability 
A)  Transport of choline into the neuron 
B)  Acetylcholinesterase production 
C)  Choline acetyltransferase activity 
D)  Acetyl CoA availability

Question 10

A research scientist is interested in the effects of various toxins on the action potential in nerve cells. During one of the electrophysiological tests, the scientist injects tetrodotoxin (TTX) into the bathing solution. Which aspect of the action potential will most likely be affected by the injection of TTX?

Accepted Answer

A)  Depolarization due to K+ channel blockade 
B)  Depolarization due to Na+ channel blockade 
C)  Depolarization due to Na+ channel opening 
D)  Hyperpolarization due to K+ channel blockade 
E)  Hyperpolarization due to Na+ channel blockade 
A)  Depolarization due to K+ channel blockade 
B)  Depolarization due to Na+ channel blockade 
C)  Depolarization due to Na+ channel opening 
D)  Hyperpolarization due to K+ channel blockade 
E)  Hyperpolarization due to Na+ channel blockade

A 31-year-old woman is diagnosed with depression and prescribed a selective serotonin reuptake inhibitor. Which of the following is a precursor of serotonin?

Which of the following most accurately represents the order of events for transmission at a G-protein coupled receptor?

Connections to the globus pallidus from the putamen are an example of an inhibitory synapse in the central nervous system that utilizes which of the following neurotransmitters?

Which of the following factors influences the conduction velocity of the action potential through the axon?

The stimulus intensity required to initiate an action potential is referred to as which of the following?

In the normal axon, reverse propagation of the action potential is not possible because the membrane is

The undershoot of the action potential is primarily attributable to which of the following?

High concentrations of acetylcholine maintained at the neuromuscular junction for several seconds would result in which of the following?

Which of the following is considered the rate-limiting step in the synthesis of acetylcholine?

Introduction to the Nervous System

Development of the Nervous System

Gross Anatomy and General Organization of the Central Nervous System

Meningeal Coverings of the Brain and Spinal Cord

Ventricles and Cerebrospinal Fluid

Blood Supply of the Brain

Electrical Signaling by Neurons

Synaptic Transmission Between Neurons

Sensory Receptors and the Peripheral Nervous System

Spinal Cord

Cranial Nerves and Their Nuclei

The Chemical Senses of Taste and Smell

Hearing and Balance: the Eighth Cranial Nerve

Filters

Exam 11: Organization of the Brain Stem

A 31-year-old woman is diagnosed with depression and prescribed a selective serotonin reuptake inhibitor. Which of the following is a precursor of serotonin?

Which of the following most accurately represents the order of events for transmission at a G-protein coupled receptor?

Connections to the globus pallidus from the putamen are an example of an inhibitory synapse in the central nervous system that utilizes which of the following neurotransmitters?

Which of the following factors influences the conduction velocity of the action potential through the axon?

The stimulus intensity required to initiate an action potential is referred to as which of the following?

In the normal axon, reverse propagation of the action potential is not possible because the membrane is

The undershoot of the action potential is primarily attributable to which of the following?

High concentrations of acetylcholine maintained at the neuromuscular junction for several seconds would result in which of the following?

Which of the following is considered the rate-limiting step in the synthesis of acetylcholine?

Introduction to the Nervous System

Development of the Nervous System

Gross Anatomy and General Organization of the Central Nervous System

Meningeal Coverings of the Brain and Spinal Cord

Ventricles and Cerebrospinal Fluid

Blood Supply of the Brain

Electrical Signaling by Neurons

Synaptic Transmission Between Neurons

Sensory Receptors and the Peripheral Nervous System

Spinal Cord

Cranial Nerves and Their Nuclei

The Chemical Senses of Taste and Smell

Hearing and Balance: the Eighth Cranial Nerve

Filters