Question 1

The neurotransmitter that controls skeletal muscle contraction is

Accepted Answer

A)  beta endorphin. 
B)  nitric oxide. 
C)  acetylcholine. 
D)  GABA. 
A)  beta endorphin. 
B)  nitric oxide. 
C)  acetylcholine. 
D)  GABA.

Question 2

Most of the neurons in the brain and spinal cord are

Accepted Answer

A)  bipolar. 
B)  unipolar 
C)  multipolar. 
D)  nonpolar. 
A)  bipolar. 
B)  unipolar 
C)  multipolar. 
D)  nonpolar.

Question 3

A nerve cell membrane becomes depolarized as a result of

Accepted Answer

A)  calcium leaving the nerve cell. 
B)  some ion channels being opened while others are closed. 
C)  the relative ease with which K+ diffuses into the nerve cell. 
D)  Na+ being prevented from passing through the membrane. 
A)  calcium leaving the nerve cell. 
B)  some ion channels being opened while others are closed. 
C)  the relative ease with which K+ diffuses into the nerve cell. 
D)  Na+ being prevented from passing through the membrane.

Question 4

Several nerve fibers converging onto one neuron amplifies impulses.

Accepted Answer

A) True 
 B)False

Question 5

Every neuron has

Accepted Answer

A)  many axons. 
B)  a cell body. 
C)  myelin. 
D)  a neurilemma. 
A)  many axons. 
B)  a cell body. 
C)  myelin. 
D)  a neurilemma.

Question 6

Drugs that decrease membrane permeability to sodium

Accepted Answer

A)  are used as local anesthetics. 
B)  prevent nerve impulses from passing through the affected body part. 
C)  lessen pain. 
D)  all of the above. 
A)  are used as local anesthetics. 
B)  prevent nerve impulses from passing through the affected body part. 
C)  lessen pain. 
D)  all of the above.

Question 7

Nodes of Ranvier lie between neurons.

Accepted Answer

A) True 
 B)False

Question 8

Which of the following neuroglia are not part of the CNS?

Accepted Answer

A)  Ependymal cells 
B)  Astrocytes 
C)  Satellite cells 
D)  Microglia 
A)  Ependymal cells 
B)  Astrocytes 
C)  Satellite cells 
D)  Microglia

Question 9

In reuptake

Accepted Answer

A)  an action potential reverses direction. 
B)  a neuropeptide breaks down into amino acids, which act as neurotransmitters. 
C)  a neurotransmitter that has already been released into the synaptic cleft is taken back into the synaptic knob of the presynaptic neuron or into nearby neuroglia or neurons. 
D)  an enzyme breaks down a neurotransmitter and then another enzyme builds it back up. 
A)  an action potential reverses direction. 
B)  a neuropeptide breaks down into amino acids, which act as neurotransmitters. 
C)  a neurotransmitter that has already been released into the synaptic cleft is taken back into the synaptic knob of the presynaptic neuron or into nearby neuroglia or neurons. 
D)  an enzyme breaks down a neurotransmitter and then another enzyme builds it back up.

Question 10

Diverging axons amplify an impulse by

Accepted Answer

A)  contacting many neurons. 
B)  returning the impulse to the neuron of origin. 
C)  splitting into multiple axons. 
D)  stimulating themselves. 
A)  contacting many neurons. 
B)  returning the impulse to the neuron of origin. 
C)  splitting into multiple axons. 
D)  stimulating themselves.

Question 11

The cytoplasmic extensions that, together with the cell body, provide the main receptive surfaces for neurons are

Accepted Answer

A)  neurofibrils. 
B)  chromatophilic substance (Nissl bodies). 
C)  axons. 
D)  dendrites. 
A)  neurofibrils. 
B)  chromatophilic substance (Nissl bodies). 
C)  axons. 
D)  dendrites.

Question 12

If a neurotransmitter hyperpolarizes a cell membrane and an action potential is less likely, the change is called ______ ______ ______.

Accepted Answer

inhibitory

Question 13

Muscles and glands that respond to nervous stimulation are called _______.

Accepted Answer

The answer of Muscles and glands that respond to nervous...

Question 14

What is the correct sequence of events along an axon that follows a membrane reaching threshold potential? 1. The membrane depolarizes.
2) Sodium channels open and sodium ions diffuse inward.
3) The membrane repolarizes.
4) Potassium channels open and potassium ions diffuse outward.

Accepted Answer

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

Question 15

The nervous system

Accepted Answer

A)  detects changes in the internal or external environment. 
B)  controls the movement of muscles. 
C)  integrates information from several sources and uses it to determine an appropriate response. 
D)  all of the above. 
A)  detects changes in the internal or external environment. 
B)  controls the movement of muscles. 
C)  integrates information from several sources and uses it to determine an appropriate response. 
D)  all of the above.

Question 16

Myelin

Accepted Answer

A)  is released from a neuron and travels to another neuron. 
B)  consists of layers of lipids and proteins that wrap around an axon. 
C)  is produced in response to bacterial infection. 
D)  is a form of chromatophilic substance that fills Schwann cells. 
A)  is released from a neuron and travels to another neuron. 
B)  consists of layers of lipids and proteins that wrap around an axon. 
C)  is produced in response to bacterial infection. 
D)  is a form of chromatophilic substance that fills Schwann cells.

Question 17

Because the response of a nerve fiber is all-or-none, a greater intensity of stimulus does not produce a stronger impulse.

Accepted Answer

A) True 
 B)False

Question 18

In convergence, two or more incoming fibers contact a single neuron, whereas in divergence, impulses leaving a neuron pass into several output fibers.

Accepted Answer

A) True 
 B)False

Question 19

Three general functions of the nervous system are

Accepted Answer

A)  sensory, motor, and predictive. 
B)  integrative, motor, and sensory. 
C)  predictive, manipulative, and integrative. 
D)  reflexive, sensory, and predictive. 
A)  sensory, motor, and predictive. 
B)  integrative, motor, and sensory. 
C)  predictive, manipulative, and integrative. 
D)  reflexive, sensory, and predictive.

Question 20

A nerve is a single neuron that transmits impulses.

Accepted Answer

A) True 
 B)False

Exam 10: Nervous System I: Basic Structure and Function

The neurotransmitter that controls skeletal muscle contraction is

Most of the neurons in the brain and spinal cord are

A nerve cell membrane becomes depolarized as a result of

Several nerve fibers converging onto one neuron amplifies impulses.

Every neuron has

Drugs that decrease membrane permeability to sodium

Nodes of Ranvier lie between neurons.

Which of the following neuroglia are not part of the CNS?

In reuptake

Diverging axons amplify an impulse by

The cytoplasmic extensions that, together with the cell body, provide the main receptive surfaces for neurons are

If a neurotransmitter hyperpolarizes a cell membrane and an action potential is less likely, the change is called ______ ______ ______.

Muscles and glands that respond to nervous stimulation are called _______.

What is the correct sequence of events along an axon that follows a membrane reaching threshold potential? 1. The membrane depolarizes. 2) Sodium channels open and sodium ions diffuse inward. 3) The membrane repolarizes. 4) Potassium channels open and potassium ions diffuse outward.

The nervous system

Myelin

Because the response of a nerve fiber is all-or-none, a greater intensity of stimulus does not produce a stronger impulse.

In convergence, two or more incoming fibers contact a single neuron, whereas in divergence, impulses leaving a neuron pass into several output fibers.

Three general functions of the nervous system are

A nerve is a single neuron that transmits impulses.

Introduction to Human Anatomy and Physiology

Chemical Basis of Life

Cells

Cellular Metabolism

Tissues

Integumentary System

Skeletal System

Joints of the Skeletal System

Muscular System

Nervous System II: Division of the Nervous System

Nervous System III: Senses

Endocrine System

Blood

Cardiovascular System

Lymphatic System and Immunity

Digestive System

Nutrition and Metabolism

Respiratory System

Urinary System

Water, Electrolyte, and Acid-Based Balance

Reproductive Systems

Pregnancy, Growth, and Development

Genetics and Genomics

Filters

If a neurotransmitter hyperpolarizes a cell membrane and an action potential is less likely, the change is called __.