Question 1

Where does saltatory conduction occur?

Accepted Answer

A)  From node to node in myelinated fibers 
B)  From node to node in unmyelinated fibers 
C)  Down the entire length of a myelinated fiber 
D)  Down the entire length of an unmyelinated fiber 
A)  From node to node in myelinated fibers 
B)  From node to node in unmyelinated fibers 
C)  Down the entire length of a myelinated fiber 
D)  Down the entire length of an unmyelinated fiber

Question 2

Acetylcholine triggers the synthesis of the second messenger cAMP only in neurons of the PNS.

Accepted Answer

A) True 
 B)False

Question 3

Which of the following ions has the greatest influence on the resting membrane potential?

Accepted Answer

A)  Sodium 
B)  Chloride 
C)  Calcium 
D)  Phosphate 
E)  Potassium 
A)  Sodium 
B)  Chloride 
C)  Calcium 
D)  Phosphate 
E)  Potassium

Question 4

Some antidepressant drugs act by inhibiting monoamine oxidase (MAO).What is the function of this enzyme?

Accepted Answer

A)  It binds to chloride gates. 
B)  It breaks down monoamines. 
C)  It blocks sodium channels. 
D)  It converts ATP to cyclic AMP. 
E)  It degrades acetylcholine. 
A)  It binds to chloride gates. 
B)  It breaks down monoamines. 
C)  It blocks sodium channels. 
D)  It converts ATP to cyclic AMP. 
E)  It degrades acetylcholine.

Question 5

Which cells form myelin in the spinal cord?

Accepted Answer

A)  Schwann cells 
B)  Astrocytes 
C)  Satellite cells 
D)  Oligodendrocytes 
E)  Microglia 
A)  Schwann cells 
B)  Astrocytes 
C)  Satellite cells 
D)  Oligodendrocytes 
E)  Microglia

Question 6

Nitric oxide (NO)acts as a neuromodulator by altering synaptic function.

Accepted Answer

A) True 
 B)False

Question 7

In a myelinated fiber,only the initial segment in the trigger zone has voltage-regulated channels.

Accepted Answer

A) True 
 B)False

Question 8

Which neurotransmitter excites skeletal muscle and inhibits cardiac muscle?

Accepted Answer

A)  Norepinephrine 
B)  Dopamine 
C)  Histamine 
D)  Acetylcholine 
E)  β-endorphin 
A)  Norepinephrine 
B)  Dopamine 
C)  Histamine 
D)  Acetylcholine 
E)  β-endorphin

Question 9

In which part of a neuron is the postsynaptic membrane usually found?

Accepted Answer

A)  Axon terminal 
B)  Axon 
C)  Dendrite 
D)  Perikaryon 
E)  Axon collateral 
A)  Axon terminal 
B)  Axon 
C)  Dendrite 
D)  Perikaryon 
E)  Axon collateral

Question 10

A neuron receives a stimulus.Which of the following events happens next?

Accepted Answer

A)  A local potential develops 
B)  Threshold is reached 
C)  Hyperpolarization of the membrane 
D)  Repolarization of the membrane 
E)  A resting membrane potential is established 
A)  A local potential develops 
B)  Threshold is reached 
C)  Hyperpolarization of the membrane 
D)  Repolarization of the membrane 
E)  A resting membrane potential is established

Question 11

An action potential never occurs in dendrites.

Accepted Answer

A) True 
 B)False

Question 12

What would be the best explanation for why myelinated fibers conduct signals faster than unmyelinated fibers?

Accepted Answer

A)  There are no internodes in unmyelinated fibers. 
B)  There are more internodes in unmyelinated fibers. 
C)  Facilitated diffusion of sodium and potassium is faster in myelinated fibers. 
D)  Active transport of sodium and potassium is faster in myelinated fibers. 
E)  Diffusion of ions along the axoplasm is faster. 
A)  There are no internodes in unmyelinated fibers. 
B)  There are more internodes in unmyelinated fibers. 
C)  Facilitated diffusion of sodium and potassium is faster in myelinated fibers. 
D)  Active transport of sodium and potassium is faster in myelinated fibers. 
E)  Diffusion of ions along the axoplasm is faster.

Question 13

What property of neurons allows them to respond to changes in the environment?

Accepted Answer

A)  Excitablity 
B)  Conductivity 
C)  Secretion 
D)  Permeability 
A)  Excitablity 
B)  Conductivity 
C)  Secretion 
D)  Permeability

Question 14

Which of these is an example of an EPSP in a typical neuron?

Accepted Answer

A)  A voltage change from 0 mV to +0.35 mV 
B)  A voltage change from -70 mV to -69.5 mV 
C)  A voltage change from -69.5 mV to -70 mV 
D)  A voltage change from +35 mV to 0 mV 
E)  A voltage change from -70 mV to -70.5 mV 
A)  A voltage change from 0 mV to +0.35 mV 
B)  A voltage change from -70 mV to -69.5 mV 
C)  A voltage change from -69.5 mV to -70 mV 
D)  A voltage change from +35 mV to 0 mV 
E)  A voltage change from -70 mV to -70.5 mV

Question 15

What is the primary site on a neuron for receiving signals from other neurons?

Accepted Answer

A)  The axon terminals 
B)  The axons 
C)  The axon collaterals 
D)  The neurosomas 
E)  The dendrites 
A)  The axon terminals 
B)  The axons 
C)  The axon collaterals 
D)  The neurosomas 
E)  The dendrites

Question 16

What is the most common type of neuron?

Accepted Answer

A)  Multipolar 
B)  Bipolar 
C)  Unipolar 
D)  Anaxonic 
E)  Dendritic 
A)  Multipolar 
B)  Bipolar 
C)  Unipolar 
D)  Anaxonic 
E)  Dendritic

Question 17

While a neuron membrane is depolarizing its __________.

Accepted Answer

A)  chloride gates are partially open 
B)  chloride gates are fully open 
C)  potassium gates are fully open 
D)  sodium gates are partially open 
E)  sodium gates are fully open 
A)  chloride gates are partially open 
B)  chloride gates are fully open 
C)  potassium gates are fully open 
D)  sodium gates are partially open 
E)  sodium gates are fully open

Exam 12: Nervous Tissue

Where does saltatory conduction occur?

Acetylcholine triggers the synthesis of the second messenger cAMP only in neurons of the PNS.

Which of the following ions has the greatest influence on the resting membrane potential?

Some antidepressant drugs act by inhibiting monoamine oxidase (MAO).What is the function of this enzyme?

Which cells form myelin in the spinal cord?

Nitric oxide (NO)acts as a neuromodulator by altering synaptic function.

In a myelinated fiber,only the initial segment in the trigger zone has voltage-regulated channels.

Which neurotransmitter excites skeletal muscle and inhibits cardiac muscle?

In which part of a neuron is the postsynaptic membrane usually found?

A neuron receives a stimulus.Which of the following events happens next?

An action potential never occurs in dendrites.

What would be the best explanation for why myelinated fibers conduct signals faster than unmyelinated fibers?

What property of neurons allows them to respond to changes in the environment?

Which of these is an example of an EPSP in a typical neuron?

What is the primary site on a neuron for receiving signals from other neurons?

What is the most common type of neuron?

While a neuron membrane is depolarizing its __________.

Major Themes of Anatomy and Physiology

The Chemistry of Life

Cellular Form and Function

Genetics of Cellular Function

Histology

The Integumentary System

Bone Tissue

The Skeletal System

Joints

The Muscular System

Muscular Tissue

The Spinal Cord,spinal Nerves,and Somatic Reflexes

The Brain and Cranial Nerves

The Autonomic Nervous System and Visceral Reflexes

Sense Organs

The Endocrine System

The Circulatory System: Blood

The Circulatory System: Heart

The Circulatory System: Blood Vessels and Circulation

The Lymphatic and Immune Systems

The Respiratory System

The Urinary System

Fluid, electrolyte, and Acidbase Balance

The Digestive System

Nutrition and Metabolism

The Male Reproductive System

The Female Reproductive System

Human Development and Aging

Atlas a General Orientation to Human Anatomy

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