Question 1

A nerve impulse travels about __________ times faster when it leaps between nodes of Ranvier than when it travels along an unmyelinated axon.

Accepted Answer

A)  5 
B)  10 
C)  20 
D)  100 
E)  50 
A)  5 
B)  10 
C)  20 
D)  100 
E)  50

Question 2

The cells that detect internal and external conditions are

Accepted Answer

A)  sensors. 
B)  motivators. 
C)  effectors. 
D)  collaborators. 
E)  axons. 
A)  sensors. 
B)  motivators. 
C)  effectors. 
D)  collaborators. 
E)  axons.

Question 3

Figuer:

-In the figure,which of the following was the dependent variable?

Accepted Answer

A)  concentration of saxitoxin fed to the clams 
B)  rate of Na+ flow across the membrane of the clam neuron 
C)  ability of clams to burrow 
D)  location from which the clams were isolated 
E)  species of algae fed to the clams 
A)  concentration of saxitoxin fed to the clams 
B)  rate of Na+ flow across the membrane of the clam neuron 
C)  ability of clams to burrow 
D)  location from which the clams were isolated 
E)  species of algae fed to the clams

Question 4

Which of the following best describes how a neuron fires?

Accepted Answer

A)  Na+ ions cross the plasma membrane, initiating a wave that travels down the axon. 
B)  Vesicles carry neurotransmitters from the nucleus to the other end of the neuron. 
C)  Na+ ions enter one end of the neuron and diffuse to the other end, down the axon. 
D)  Neurotransmitters enter one end of the neuron and diffuse to the other end, down the axon. 
E)  Neurotransmitters cross the plasma membrane, creating a wave that travels down the axon. 
A)  Na+ ions cross the plasma membrane, initiating a wave that travels down the axon. 
B)  Vesicles carry neurotransmitters from the nucleus to the other end of the neuron. 
C)  Na+ ions enter one end of the neuron and diffuse to the other end, down the axon. 
D)  Neurotransmitters enter one end of the neuron and diffuse to the other end, down the axon. 
E)  Neurotransmitters cross the plasma membrane, creating a wave that travels down the axon.

Question 5

The purpose of the nodes of Ranvier is to start nerve impulses.

Accepted Answer

A) True 
 B)False

Question 6

In a spinal cord injury,nerve signals cannot proceed past the location of the injury.A person who is quadriplegic can move their head and neck,but not their arms,abdomen,or legs.Which part of their spinal cord was damaged?

Accepted Answer

A)  thoracic 
B)  lumbar 
C)  cervical 
D)  sacral 
E)  coccyx 
A)  thoracic 
B)  lumbar 
C)  cervical 
D)  sacral 
E)  coccyx

Question 7

If you read about a drug designed to lead to more release of dopamine from the synaptic terminals of certain brain neurons,you would know that the drug was designed to fix synaptic function and thus cure

Accepted Answer

A)  epilepsy. 
B)  insomnia. 
C)  Alzheimer disease. 
D)  Huntington disease. 
E)  Parkinson disease. 
A)  epilepsy. 
B)  insomnia. 
C)  Alzheimer disease. 
D)  Huntington disease. 
E)  Parkinson disease.

Question 8

The rounded part of a neuron containing the nucleus and mitochondria is the

Accepted Answer

A)  node of Ranvier. 
B)  axon. 
C)  synapse. 
D)  dendrite. 
E)  cell body. 
A)  node of Ranvier. 
B)  axon. 
C)  synapse. 
D)  dendrite. 
E)  cell body.

Question 9

In a spinal cord injury,nerve signals cannot proceed past the location of the injury.A person who is paraplegic can move their head,arm,neck,and hands,but not their abdomen or legs.Which part of their spinal cord was damaged?

Accepted Answer

A)  thoracic 
B)  cervical 
C)  lumbar 
D)  sacral 
E)  coccyx 
A)  thoracic 
B)  cervical 
C)  lumbar 
D)  sacral 
E)  coccyx

Question 10

In a neuron at rest,

Accepted Answer

A)  active transport is not occurring. 
B)  sodium ions are more concentrated inside the cell than outside. 
C)  very little metabolism is taking place. 
D)  the inside of a neuron is positively charged as compared to the outside. 
E)  potassium ions are more concentrated inside the cell than outside. 
A)  active transport is not occurring. 
B)  sodium ions are more concentrated inside the cell than outside. 
C)  very little metabolism is taking place. 
D)  the inside of a neuron is positively charged as compared to the outside. 
E)  potassium ions are more concentrated inside the cell than outside.

Question 11

Neurotransmitters released from a presynaptic cell must travel across a tiny space called a synaptic cleft.

Accepted Answer

A) True 
 B)False

Question 12

Saxitoxin is produced by dinoflagellates.

Accepted Answer

A) True 
 B)False

Question 13

The parasympathetic nervous system is responsible for "rest and repose" types of neural activities.

Accepted Answer

A) True 
 B)False

Question 14

The layered membranes that jacket the central nervous system are the

Accepted Answer

A)  grey matter. 
B)  meninges. 
C)  white matter. 
D)  epidermis. 
E)  myelin sheaths. 
A)  grey matter. 
B)  meninges. 
C)  white matter. 
D)  epidermis. 
E)  myelin sheaths.

Question 15

The part of the brain that is responsible for homeostatic control of most organs is the

Accepted Answer

A)  cerebellum. 
B)  hypothalamus. 
C)  medulla oblongata. 
D)  pons. 
E)  cerebrum. 
A)  cerebellum. 
B)  hypothalamus. 
C)  medulla oblongata. 
D)  pons. 
E)  cerebrum.

Question 16

Usually nerve impulses travel from one neuron to another by

Accepted Answer

A)  neurotransmitters. 
B)  action potentials. 
C)  resting potentials. 
D)  threshold potentials. 
E)  nodes of Ranvier. 
A)  neurotransmitters. 
B)  action potentials. 
C)  resting potentials. 
D)  threshold potentials. 
E)  nodes of Ranvier.

Question 17

In myelinated axons,_____ ions can diffuse _____ the axon only at nodes of Ranvier.

Accepted Answer

A)  potassium; into 
B)  sodium; into 
C)  sodium; out of 
D)  All of the answer choices are correct. 
A)  potassium; into 
B)  sodium; into 
C)  sodium; out of 
D)  All of the answer choices are correct.

Question 18

Drugs called selective serotonin reuptake inhibitors (SSRIs)block reuptake of serotonin and are used to treat depression.Which of the following would occur in a patient given a SSRI?

Accepted Answer

A)  Serotonin levels would decrease in the synapse. 
B)  Serotonin levels would increase in the synapse. 
C)  More serotonin would be released by the neuron. 
D)  Less serotonin would be released by the neuron. 
E)  The neuron would switch from serotonin to another neurotransmitter. 
A)  Serotonin levels would decrease in the synapse. 
B)  Serotonin levels would increase in the synapse. 
C)  More serotonin would be released by the neuron. 
D)  Less serotonin would be released by the neuron. 
E)  The neuron would switch from serotonin to another neurotransmitter.

Question 19

The part of the neuron that is usually a single long extension that conducts an impulse to a muscle or another neuron is the

Accepted Answer

A)  synapse. 
B)  cell body. 
C)  axon. 
D)  dendrite. 
E)  node of Ranvier. 
A)  synapse. 
B)  cell body. 
C)  axon. 
D)  dendrite. 
E)  node of Ranvier.

Question 20

The nervous tissue that consists of myelinated axons transmitting information throughout the central nervous system is the

Accepted Answer

A)  white corpuscles. 
B)  grey matter. 
C)  red corpuscles. 
D)  red matter. 
E)  white matter. 
A)  white corpuscles. 
B)  grey matter. 
C)  red corpuscles. 
D)  red matter. 
E)  white matter.

Exam 26: The Nervous System

A nerve impulse travels about __________ times faster when it leaps between nodes of Ranvier than when it travels along an unmyelinated axon.

The cells that detect internal and external conditions are

Figuer: -In the figure,which of the following was the dependent variable?

Which of the following best describes how a neuron fires?

The purpose of the nodes of Ranvier is to start nerve impulses.

In a spinal cord injury,nerve signals cannot proceed past the location of the injury.A person who is quadriplegic can move their head and neck,but not their arms,abdomen,or legs.Which part of their spinal cord was damaged?

If you read about a drug designed to lead to more release of dopamine from the synaptic terminals of certain brain neurons,you would know that the drug was designed to fix synaptic function and thus cure

The rounded part of a neuron containing the nucleus and mitochondria is the

In a spinal cord injury,nerve signals cannot proceed past the location of the injury.A person who is paraplegic can move their head,arm,neck,and hands,but not their abdomen or legs.Which part of their spinal cord was damaged?

In a neuron at rest,

Neurotransmitters released from a presynaptic cell must travel across a tiny space called a synaptic cleft.

Saxitoxin is produced by dinoflagellates.

The parasympathetic nervous system is responsible for "rest and repose" types of neural activities.

The layered membranes that jacket the central nervous system are the

The part of the brain that is responsible for homeostatic control of most organs is the

Usually nerve impulses travel from one neuron to another by

In myelinated axons,_____ ions can diffuse _____ the axon only at nodes of Ranvier.

Drugs called selective serotonin reuptake inhibitors (SSRIs)block reuptake of serotonin and are used to treat depression.Which of the following would occur in a patient given a SSRI?

The part of the neuron that is usually a single long extension that conducts an impulse to a muscle or another neuron is the

The nervous tissue that consists of myelinated axons transmitting information throughout the central nervous system is the

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In myelinated axons,_ ions can diffuse _ the axon only at nodes of Ranvier.