Chapter 43 – The Nervous System
62. If you were to compare the resting potential of a neuron to a battery, which way is the
battery oriented?
63. How does the resting potential of a typical neuron compare to that of a 1.5V AA alkaline
battery?
64. To process information, postsynaptic neurons often add up simultaneous signals from
several presynaptic neurons. Which structure and process allow them to do so?
Chapter 43 – The Nervous System
65. A neuron that engages in spatial summation acquires a mutation that causes dendrite
overgrowth and promiscuous synapsing. What is the likely outcome?
Clarify Question
•
What is the key concept addressed by the question?
• What type of thinking is required?
Gather Content/Choose Answer
•
What do you already know about summation? What other information is related to the
question?
Reflect on Process
•
Did your problem-solving process lead you to the correct answer? If not, where did the
process break down or lead you astray? How can you revise your approach to produce a
more desirable result?
Chapter 43 – The Nervous System
True / False Questions
66. True or false: neurons are the only electrically-active cells.
Multiple Choice Questions
67. What important resource do Schwann cells and oligodendrocytes provide to neurons?
Chapter 43 – The Nervous System
68. A patient suffers from a disease that slows fatty acid synthesis. What is a likely impact of
this disease on nervous system function?
Clarify Question
•
What is the key concept addressed by the question?
•
What type of thinking is required?
importance of fatty acids to a potential nervous system disease.
Gather Content/Choose Answer
•
What do you already know about fatty acids? What other information is related to the
question?
Reflect on Process
•
Did your problem-solving process lead you to the correct answer? If not, where did the
process break down or lead you astray? How can you revise your approach to produce a
more desirable result?
Chapter 43 – The Nervous System
Check All That Apply Questions
Chapter 43 – The Nervous System
69. “Synapses are connections between the axon of one neuron and the dendrite of another
neuron, where neurotransmitters transmit a chemical signal.” How would you modify this
statement to make it more complete? (Check all that apply.)
Clarify Question
•
What is the key concept addressed by the question?
•
What type of thinking is required?
Gather Content/Choose Answer
•
What do you already know about synapses? What other information is related to the
question?
Reflect on Process
•
Did your problem-solving process lead you to the correct answer? If not, where did the
process break down or lead you astray? How can you revise your approach to produce a
more desirable result?
True / False Questions
Chapter 43 – The Nervous System
70. True or false: When a neuron is not firing, the sodium-potassium pump is inactive.
Check All That Apply Questions
71. Choose the two primary factors that contribute to the resting membrane potential of a
neuron.
Multiple Choice Questions
72. Is the resting membrane potential of a neuron closer to the equilibrium potential for K+ or
Na+?
Chapter 43 – The Nervous System
73. Three-quarters of the substantial amount of energy consumed by the brain is used to run a
single molecular machine that maintains the resting potential of neurons. What is this machine
called?
74. A Hawaiian legend tells of a village that angered a shark god. In revenge, a “seaweed”
began to grow in the tidepools that killed anyone who touched it. In fact, this “limu-make-o-
Hana” — a zoanthid cnidarian — contains a palytoxin that locks the sodium-potassium pump
open, allowing free flow of ions. If a villager suffers palytoxin poisoning, which way will the
ions in his neurons flow?
Chapter 43 – The Nervous System
Clarify Question
•
What is the key concept addressed by the question?
•
What type of thinking is required?
Gather Content/Choose Answer
•
What do you already know about sodium and potassium? What other information is
related to the question?
Reflect on Process
•
Did your problem-solving process lead you to the correct answer? If not, where did the
process break down or lead you astray? How can you revise your approach to produce a
more desirable result?
75. What is the likely impact of this toxin on the resting potential of a neuron?
Chapter 43 – The Nervous System
Clarify Question
•
What is the key concept addressed by the question?
•
What type of thinking is required?
Gather Content/Choose Answer
•
What do you already know about sodium and potassium? What other information is
related to the question?
Reflect on Process
•
Did your problem-solving process lead you to the correct answer? If not, where did the
process break down or lead you astray? How can you revise your approach to produce a
more desirable result?
Chapter 43 – The Nervous System
76. What is the likely impact of this toxin on action potentials?
Clarify Question
•
What is the key concept addressed by the question?
•
What type of thinking is required?
Gather Content/Choose Answer
•
What do you already know about sodium and potassium? What other information is
related to the question?
Reflect on Process
•
Did your problem-solving process lead you to the correct answer? If not, where did the
process break down or lead you astray? How can you revise your approach to produce a
more desirable result?
Chapter 43 – The Nervous System
77. Since there is a larger concentration of potassium ions inside a neuron, why is the inside
of the neuron negative (-70mV) relative to the outside?
78. Sodium ions are single atoms. Why can’t they simply diffuse through the cell membrane’s
lipid bilayer?
Chapter 43 – The Nervous System
79. If K+ can exit the cell through leak channels, why don’t they flow out until there are equal
concentrations on both sides of the membrane?
80. The outside of a neuron is positively charged at resting potential. Why do K+ ions leave
the cell when K+ channels open during an action potential?
81. The outside of a neuron is positively charged at resting potential. Why don’t negative ions
exit from the cell to normalize charge across the membrane?
Chapter 43 – The Nervous System
82. What does the Nernst equation allow us to do?
Check All That Apply Questions
83. When an action potential begins and sodium channels open, why does sodium rush into
the cell? (Check all that apply.)
Ranking Questions
84. What is the basis of the typical -70mV resting potential in neurons? Rank the factors in
order from most important to least important.
Multiple Choice Questions
Chapter 43 – The Nervous System
85. What limits the frequency of action potentials?
Check All That Apply Questions