Question 1

Describe the sequence of events that lead to neurotransmitter release from a presynaptic neuron.

Accepted Answer

This process is summ

Question 2

The myelin sheath:

Accepted Answer

A)  is a protein covering around dendrites. 
B)  is responsible for integrating information. 
C)  is a fatty covering only around axons. 
D)  stores neurotransmitters in the axon. 
E)  is a fatty covering only around cell bodies. 
A)  is a protein covering around dendrites. 
B)  is responsible for integrating information. 
C)  is a fatty covering only around axons. 
D)  stores neurotransmitters in the axon. 
E)  is a fatty covering only around cell bodies.

Question 3

What is a characteristic of the all-or-none response?

Accepted Answer

A)  If a stimulus is strong enough, all axons in a nerve bundle will fire simultaneously. 
B)  A neuron will only produce an action potential if it has been depolarized to its threshold level. 
C)  All neurons of a nerve bundle discharge impulses at the same frequency. 
D)  A neuron can create an action potential of varying intensities. 
E)  Either all or none of the neurons of a brain region will fire impulses when stimulated. 
A)  If a stimulus is strong enough, all axons in a nerve bundle will fire simultaneously. 
B)  A neuron will only produce an action potential if it has been depolarized to its threshold level. 
C)  All neurons of a nerve bundle discharge impulses at the same frequency. 
D)  A neuron can create an action potential of varying intensities. 
E)  Either all or none of the neurons of a brain region will fire impulses when stimulated.

Question 4

Figure 41-1   Refer to the accompanying figure. The absence of structures represented by label 6 would result in:

Accepted Answer

A)  increased speed of impulse transmission 
B)  decreased speed of impulse transmission 
C)  enhanced saltatory conduction 
D)  complete loss of impulse transmission 
E)  complete loss of neurotransmitter release 
A)  increased speed of impulse transmission 
B)  decreased speed of impulse transmission 
C)  enhanced saltatory conduction 
D)  complete loss of impulse transmission 
E)  complete loss of neurotransmitter release

Question 5

What is a neuronal attribute that contributes to the resting membrane potential?

Accepted Answer

A)  Potassium is kept at a high concentration outside the cell compared with the inside. 
B)  Sodium is kept at a high concentration inside the cell compared with the outside. 
C)  Neurons are more permeable to sodium than they are to potassium. 
D)  The cytosol contains large molecules that have a net positive charge. 
E)  The cytosol contains large molecules that have a net negative charge. 
A)  Potassium is kept at a high concentration outside the cell compared with the inside. 
B)  Sodium is kept at a high concentration inside the cell compared with the outside. 
C)  Neurons are more permeable to sodium than they are to potassium. 
D)  The cytosol contains large molecules that have a net positive charge. 
E)  The cytosol contains large molecules that have a net negative charge.

Question 6

Which molecule is the major excitatory neurotransmitter in the brain?

Accepted Answer

A)  GABA 
B)  glutamate 
C)  serotonin 
D)  dopamine 
E)  acetylcholine 
A)  GABA 
B)  glutamate 
C)  serotonin 
D)  dopamine 
E)  acetylcholine

Exam 41: Neural Signaling

Describe the sequence of events that lead to neurotransmitter release from a presynaptic neuron.

The myelin sheath:

What is a characteristic of the all-or-none response?

Figure 41-1 Refer to the accompanying figure. The absence of structures represented by label 6 would result in:

What is a neuronal attribute that contributes to the resting membrane potential?

Which molecule is the major excitatory neurotransmitter in the brain?

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