Question 1

In the first phase of triggering an action potential in a neuron,Na+ ions flow in and

Accepted Answer

A)  only trigger a negative feedback loop. 
B)  only trigger a positive feedback loop. 
C)  only activate the sodium/potassium pump. 
D)  trigger a negative feedback loop and activate the sodium/potassium pump. 
E)  trigger a positive feedback loop and activate the sodium/potassium pump. 
A)  only trigger a negative feedback loop. 
B)  only trigger a positive feedback loop. 
C)  only activate the sodium/potassium pump. 
D)  trigger a negative feedback loop and activate the sodium/potassium pump. 
E)  trigger a positive feedback loop and activate the sodium/potassium pump.

Question 2

A chemical synapse ALWAYS includes ________.
1)axon terminal
2)presynaptic cell
3)synaptic cleft
4)postsynaptic cell
5)dendrite

Accepted Answer

A)  1, 2, 3, 4, 5 
B)  1, 2, 3, 4 
C)  2, 3, 4 
D)  2, 3, 4, 5 
E)  1, 3, 4 
A)  1, 2, 3, 4, 5 
B)  1, 2, 3, 4 
C)  2, 3, 4 
D)  2, 3, 4, 5 
E)  1, 3, 4

Question 3

The absolute refractory period is important in unidirectional propagation of action potentials.

Accepted Answer

A) True 
 B)False

Question 4

The rising phase of the action potential is due to

Accepted Answer

A)  Na+ flow into the cell only. 
B)  Na+ flow out of the cell only. 
C)  K+ flow out of the cell only. 
D)  K+ flow into the cell only. 
E)  Na+ flow out of the cell and K+ flow into the cell. 
A)  Na+ flow into the cell only. 
B)  Na+ flow out of the cell only. 
C)  K+ flow out of the cell only. 
D)  K+ flow into the cell only. 
E)  Na+ flow out of the cell and K+ flow into the cell.

Question 5

Inhibition of neural activity can result from

Accepted Answer

A)  presynaptic events only. 
B)  postsynaptic events only. 
C)  presynaptic events and postsynaptic events. 
A)  presynaptic events only. 
B)  postsynaptic events only. 
C)  presynaptic events and postsynaptic events.

Question 6

Discuss the membrane permeabilities of major ions and how they contribute to the overall resting membrane potential of neurons.

Accepted Answer

The average resting membrane potential i

Question 7

The text states "all action potentials are identical to one another." There is an exception,however,where an action potential can have a smaller than normal amplitude.When does this occur and how?

Accepted Answer

During the relative refractory period,a

Question 8

How would the absolute refractory period be affected if voltage-gated sodium channels remained inactivated?

Accepted Answer

A)  It would be longer than normal. 
B)  It would be shorter than normal. 
C)  It would be the same whether the channels remained inactivated or not. 
D)  None of the answers are correct. 
A)  It would be longer than normal. 
B)  It would be shorter than normal. 
C)  It would be the same whether the channels remained inactivated or not. 
D)  None of the answers are correct.

Question 9

What is a channelopathy,and what are some examples?

Accepted Answer

See the first "Clini

Question 10

For ________ to occur,a second potential must arrive before a previous one has been completed.

Accepted Answer

The answer of For ________ to occur,a second potential must...

Question 11

In a laboratory situation,a nerve can be stimulated by applying voltage from a stimulator.If a stimulus was applied in the middle of a nerve roughly halfway between the cell bodies and the axon terminals,would resulting action potentials travel only from the stimulus point to the axon terminal? Why or why not? How is this similar to or different from the basic characteristics of an action potential discussed in this chapter? What does this tell you about the nature of the axon?

Accepted Answer

Action potentials would travel in both d

Question 12

The term hyperkalemia specifically indicates too much potassium in which fluid compartment?

Accepted Answer

A)  blood 
B)  intracellular 
C)  interstitial 
D)  extracellular 
E)  All of the answers are correct. 
A)  blood 
B)  intracellular 
C)  interstitial 
D)  extracellular 
E)  All of the answers are correct.

Question 13

Match the term with its description (answers may be used more than once).
-location of voltage-gated ion channels

Accepted Answer

A) ependymal cells 
B) astrocytes 
C) satellite cells 
D) Schwann cells 
E) oligodendrocytes
F)microglia 
A) ependymal cells 
B) astrocytes 
C) satellite cells 
D) Schwann cells 
E) oligodendrocytes
F)microglia

Question 14

The addition of stimuli arriving in rapid succession to produce an action potential is called ________.

Accepted Answer

The answer of The addition of stimuli arriving in rapid...

Question 15

How does the function of dendritic spines in the CNS differ from dendrites in the PNS?

Accepted Answer

Dendritic spines have polyribosomes to m

Question 16

Autonomic motor neurons are subdivided into the

Accepted Answer

A)  visceral and somatic divisions. 
B)  sympathetic and parasympathetic divisions. 
C)  central and peripheral divisions. 
D)  visceral and enteric divisions. 
E)  somatic and enteric divisions. 
A)  visceral and somatic divisions. 
B)  sympathetic and parasympathetic divisions. 
C)  central and peripheral divisions. 
D)  visceral and enteric divisions. 
E)  somatic and enteric divisions.

Question 17

These glial cells act as scavengers.

Accepted Answer

A)  Schwann cells 
B)  astrocytes 
C)  microglia 
D)  oligodendrocytes 
E)  ependymal cells 
A)  Schwann cells 
B)  astrocytes 
C)  microglia 
D)  oligodendrocytes 
E)  ependymal cells

Question 18

An influx of Na+ ions depolarizes the membrane of an axon.

Accepted Answer

A) True 
 B)False

Question 19

Interneurons are found

Accepted Answer

A)  only in the brain. 
B)  only in the spinal cord. 
C)  only in the CNS. 
D)  throughout the nervous system. 
E)  only in spinal nerves. 
A)  only in the brain. 
B)  only in the spinal cord. 
C)  only in the CNS. 
D)  throughout the nervous system. 
E)  only in spinal nerves.

Question 20

The two types of electrical signals in neurons are ________.

Accepted Answer

graded pot

Exam 8: Neurons: Cellular and Network Properties

In the first phase of triggering an action potential in a neuron,Na+ ions flow in and

A chemical synapse ALWAYS includes ________. 1)axon terminal 2)presynaptic cell 3)synaptic cleft 4)postsynaptic cell 5)dendrite

The absolute refractory period is important in unidirectional propagation of action potentials.

The rising phase of the action potential is due to

Inhibition of neural activity can result from

Discuss the membrane permeabilities of major ions and how they contribute to the overall resting membrane potential of neurons.

The text states "all action potentials are identical to one another." There is an exception,however,where an action potential can have a smaller than normal amplitude.When does this occur and how?

How would the absolute refractory period be affected if voltage-gated sodium channels remained inactivated?

What is a channelopathy,and what are some examples?

For ________ to occur,a second potential must arrive before a previous one has been completed.

The term hyperkalemia specifically indicates too much potassium in which fluid compartment?

Match the term with its description (answers may be used more than once). -location of voltage-gated ion channels

The addition of stimuli arriving in rapid succession to produce an action potential is called ________.

How does the function of dendritic spines in the CNS differ from dendrites in the PNS?

Autonomic motor neurons are subdivided into the

These glial cells act as scavengers.

An influx of Na+ ions depolarizes the membrane of an axon.

Interneurons are found

The two types of electrical signals in neurons are ________.

Introduction to Physiology

Molecular Interactions

Compartmentation: Cells and Tissues

Energy and Cellular Metabolism

Membrane Dynamics

Communication, Integration, and Homeostasis

Introduction to the Endocrine System

The Central Nervous System

Sensory Physiology

Efferent Division: Autonomic and Somatic Motor Control

Muscles

Integrative Physiology I: Control of Body Movement

Cardiovascular Physiology

Blood Flow and the Control of Blood Pressure

Blood

Mechanics of Breathing

Gas Exchange and Transport

The Kidneys

Integrative Physiology II: Fluid and Electrolyte Balance

The Digestive System

Metabolism and Energy Balance

Endocrine Control of Growth and Metabolism

The Immune System

Integrative Physiology III: Exercise

Reproduction and Development

Filters

In the first phase of triggering an action potential in a neuron,Na⁺ ions flow in and

An influx of Na⁺ ions depolarizes the membrane of an axon.