Question 1

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.F) A) and B)
G) A) and C)

Question 2

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

Accepted Answer

A) True 
 B)False  True

Question 3

Unmyelinated regions between adjacent myelin sheath cells are called synaptic clefts.

Accepted Answer

A) True 
 B)False

Question 4

Why would saxitoxin be water soluble?

Accepted Answer

A)  The amino and hydroxyl groups could form hydrogen bonds with water
B)  The ring structures would be attracted to each other through non-polar interactions
C)  Saxitoxin does not have any carbon atoms, and is therefore polar
D)  Saxitoxin is an ion, which thus dissolves easily in water
E)  Saxitoxin bioaccumulates up trophic levels, so it must be water solubleF) All of the above
G) A) and C)

Question 5

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)  CerebrumF) All of the above
G) A) and B)

Question 6

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 RanvierF) B) and C)
G) A) and B)

Question 7

The part of the brain that regulates essential functions such as breathing,blood pressure,and heart rate is the:

Accepted Answer

A)  Cerebellum
B)  Hypothalamus
C)  Medulla oblongata
D)  Pons
E)  CerebrumF) A) and C)
G) A) and D)

Question 8

A sleep disorder in which the brain's breathing center briefly quits working is:

Accepted Answer

A)  Insomnia
B)  Sleep apnea
C)  Narcolepsy
D)  Sleeping sickness
E)  StrokeF) A) and B)
G) B) and D)

Question 9

The three major roles of the human nervous system are:

Accepted Answer

A)  Sensory integration, glandular response, and motor response
B)  Seeing, feeling, and hearing
C)  Sensory input, sensory integration, and motor response
D)  Smooth muscle response, cardiac muscle response, and skeletal muscle responseE) B) and D)
F) All of the above

Question 10

Dopamine is an inhibitory neurotransmitter released into neuromuscular synapses.Patients with Parkinson disease have decreased dopamine.Which symptoms would be expected in a patient with Parkinson disease?

Accepted Answer

A)  Hyperactive voluntary movements
B)  Slowed senses
C)  Slowed voluntary movements
D)  Decreased mental ability and memory loss
E)  Excessive sleepingF) A) and D)
G) A) and C)

Question 11

What effect would Reminyl have on a neuron's ability to fire?

Accepted Answer

A)  It would decrease
B)  It would stay the same
C)  It would increaseD) A) and B)
E) A) and C)

Question 12

The sodium-potassium pump requires energy and a specialized protein to move ions across a nerve cell membrane.Therefore the movement of these ions is a form of:

Accepted Answer

A)  Simple diffusion
B)  Active transport
C)  Osmosis
D)  Phagocytosis
E)  Facilitated diffusionF) C) and D)
G) B) and D)

Question 13

In the peripheral nervous system,neuroglia called __________________ form the myelin sheath.

Accepted Answer

A)  Companion cells
B)  Triglycerides
C)  Schwann cells
D)  Alpha cells
E)  Trigger cellsF) A) and E)
G) B) and C)

Question 14

The dendrite,also called the nerve fiber is typically a single long extension of the cell body.

Accepted Answer

A) True 
 B)False

Question 15

The refractory period that occurs in a neuron lasts approximately five seconds.

Accepted Answer

A) True 
 B)False

Question 16

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 sheathsF) A) and D)
G) B) and D)

Question 17

A chemical that travels from a sending neuron to a receiving neuron is called a(an) :

Accepted Answer

A)  Synaptic cleft
B)  Action potential
C)  Hormone
D)  Neurotransmitter
E)  NeurotoxinF) C) and D)
G) A) and D)

Question 18

In Figure 25.21 the researchers measured a clam's ability to burrow as an indicator of paralysis due to inhibition of a Na+ transporter by saxitoxin.Which of the following would occur in sensitive clam cells that have been exposed to saxitoxin?

Accepted Answer

A)  Na+ ions would no longer be able to leave a neuron by facilitated diffusion
B)  Na+ ions would no longer be able to leave a neuron by active transport
C)  Na+ ions would no longer be able to enter a neuron by active transport
D)  Na+ ions would no longer be able to enter a neuron by facilitated diffusionE) A) and B)
F) C) and D) D

Question 19

Neurons that connect one neuron to another within the central nervous system are the interneurons.

Accepted Answer

A) True 
 B)False

Question 20

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

Accepted Answer

A)  5
B)  10
C)  20
D)  100
E)  50F) C) and E)
G) B) and D) D

Exam 25: The Nervous System

Which of the following best describes how a neuron fires?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedTrue

Unmyelinated regions between adjacent myelin sheath cells are called synaptic clefts.

Correct AnswerverifiedShow Answer

Why would saxitoxin be water soluble?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

The part of the brain that regulates essential functions such as breathing,blood pressure,and heart rate is the:

Correct AnswerverifiedShow Answer

A sleep disorder in which the brain's breathing center briefly quits working is:

Correct AnswerverifiedShow Answer

The three major roles of the human nervous system are:

Correct AnswerverifiedShow Answer

Dopamine is an inhibitory neurotransmitter released into neuromuscular synapses.Patients with Parkinson disease have decreased dopamine.Which symptoms would be expected in a patient with Parkinson disease?

Correct AnswerverifiedShow Answer

What effect would Reminyl have on a neuron's ability to fire?

Correct AnswerverifiedShow Answer

The sodium-potassium pump requires energy and a specialized protein to move ions across a nerve cell membrane.Therefore the movement of these ions is a form of:

Correct AnswerverifiedShow Answer

In the peripheral nervous system,neuroglia called __________________ form the myelin sheath.

Correct AnswerverifiedShow Answer

The dendrite,also called the nerve fiber is typically a single long extension of the cell body.

Correct AnswerverifiedShow Answer

The refractory period that occurs in a neuron lasts approximately five seconds.

Correct AnswerverifiedShow Answer

The layered membranes that jacket the central nervous system are the:

Correct AnswerverifiedShow Answer

A chemical that travels from a sending neuron to a receiving neuron is called a(an) :

Correct AnswerverifiedShow Answer

In Figure 25.21 the researchers measured a clam's ability to burrow as an indicator of paralysis due to inhibition of a Na+ transporter by saxitoxin.Which of the following would occur in sensitive clam cells that have been exposed to saxitoxin?

Correct AnswerverifiedD

Neurons that connect one neuron to another within the central nervous system are the interneurons.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedD

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True

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In Figure 25.21 the researchers measured a clam's ability to burrow as an indicator of paralysis due to inhibition of a Na⁺ transporter by saxitoxin.Which of the following would occur in sensitive clam cells that have been exposed to saxitoxin?

Correct Answer
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D

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D