Question 1

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

Question 2

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

Question 3

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

Accepted Answer

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

Question 4

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

Question 5

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

Question 6

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

Question 7

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.

Question 8

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

Accepted Answer

A) True 
 B)False

Question 9

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

Accepted Answer

A) True 
 B)False

Question 10

Which cells form myelin in the spinal cord?

Accepted Answer

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

Question 11

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

Question 12

What is the most common type of neuron?

Accepted Answer

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

Question 13

An action potential never occurs in dendrites.

Accepted Answer

A) True 
 B)False

Question 14

Which neurotransmitter excites skeletal muscle and inhibits cardiac muscle?

Accepted Answer

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

Question 15

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

Question 16

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

Accepted Answer

A) True 
 B)False

Question 17

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.

Exam 12: Nervous Tissue

Which neurotransmitter excites skeletal muscle and inhibits cardiac muscle?

Correct Answer
verified

An action potential never occurs in dendrites.

Correct Answer
verified

Where does saltatory conduction occur?

Correct Answer
verified

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

Correct Answer
verified

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

Correct Answer
verified

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

Correct Answer
verified

Which cells form myelin in the spinal cord?

Correct Answer
verified

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

Correct Answer
verified

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

Correct Answer
verified

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

Correct Answer
verified

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

Correct Answer
verified

While a neuron membrane is depolarizing its __________.

Correct Answer
verified

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

Correct Answer
verified

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

Correct Answer
verified

What is the most common type of neuron?

Correct Answer
verified

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

Correct Answer
verified

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

Correct Answer
verified

Exam 12: Nervous Tissue

Which neurotransmitter excites skeletal muscle and inhibits cardiac muscle?

Correct AnswerverifiedShow Answer

An action potential never occurs in dendrites.

Correct AnswerverifiedShow Answer

Where does saltatory conduction occur?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Which cells form myelin in the spinal cord?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

While a neuron membrane is depolarizing its __________.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

What is the most common type of neuron?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified