Question 1

Presynaptic inhibition is the opposite of

Accepted Answer

A)  coding.
B)  integration.
C)  recruitment.
D)  summation.
E)  facilitation.F) A) and E)
G) A) and D) E

Question 2

When the voltage of a plasma membrane shifts from +35mV towards 0 mV, we say the cell is

Accepted Answer

A)  depolarizing.
B)  repolarizing.
C)  hyperpolarizing.
D)  reaching the threshold.
E)  exiting the threshold.F) A) and E)
G) B) and C)

Question 3

This image shows an action potential.What does "6" represent?

Accepted Answer

A)  a critical voltage called threshold
B)  hyperpolarization of the membrane
C)  depolarization of the membrane
D)  repolarization of the membrane
E)  resting membrane potentialF) B) and E)
G) B) and D) B

Question 4

Accumulation of Ca₂+ in the synaptic knob is called , and probably plays an important role in .

Accepted Answer

A)  synaptic facilitation; short-term memory
B)  neural coding; immediate memory
C)  postsynaptic potential; long-term memory
D)  neural coding; short-term memory
E)  long-term potentiation; long-term memoryF) All of the above
G) A) and B)

Question 5

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

Accepted Answer

A) True 
 B)False

Question 6

Which of these happens first in an adrenergic synaptic transmission?

Accepted Answer

A)  ATP is converted to cyclic AMP
B)  adenylate cyclase is activated
C)  G protein dissociates from the NE receptor
D)  G protein binds to adenylate cyclase
E)  cyclic AMP induces several effects in the cellF) A) and B)
G) A) and E)

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.F) A) and C)
G) A) and E)

Question 8

Ependymal cells line the inner cavities of the CNS.

Accepted Answer

A) True 
 B)False

Question 9

Local potentials are , meaning they vary in magnitude according to the strength of the stimulus.

Accepted Answer

A)  graded
B)  reversible
C)  decremental
D)  excitatory
E)  inhibitoryF) None of the above
G) A) and B)

Question 10

Conduction speed of a nerve fiber would be the fastest in a

Accepted Answer

A)  large myelinated fiber.
B)  small myelinated fiber.
C)  large unmyelinated fiber.
D)  small unmyelinated fiber.
E)  small fiber with multiple Schwann cells.F) A) and B)
G) B) and E)

Question 11

While the 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.F) B) and D)
G) B) and E) E

Question 12

The division tends to prepare the body for action.

Accepted Answer

A)  sensory afferent
B)  motor afferent
C)  somatic motor
D)  parasympathetic
E)  sympatheticF) A) and E)
G) B) and D)

Question 13

are examples of effectors of the nervous system.

Accepted Answer

A)  Receptors
B)  Stimuli
C)  Reflexes
D)  Glands
E)  Sense organsF) C) and E)
G) A) and E)

Question 14

are the primary site for receiving signals from other neurons.

Accepted Answer

A)  Synaptic knobs
B)  Axons
C)  Axon collaterals
D)  Somas
E)  DendritesF) A) and B)
G) None of the above

Question 15

A cholinergic synapse employs as its neurotransmitter.

Accepted Answer

A)  monoamine
B)  acetylcholine
C)  epinephrine
D)  norepinephrine
E)  catecholamineF) A) and E)
G) B) and C)

Question 16

This image shows a representative neuron.What does "1" represent?

Accepted Answer

A)  synaptic knobs
B)  axons
C)  dendrites
D)  interneurons
E)  axon collateralsF) A) and B)
G) B) and D)

Question 17

An inhibitory local potential

Accepted Answer

A)  depolarizes the plasma membrane.
B)  hyperpolarizes the plasma membrane.
C)  repolarizes the plasma membrane.
D)  neutralizes the plasma membrane.
E)  drifts the membrane potential towards the resting membrane potential.F) B) and C)
G) A) and B)

Question 18

A neuron can receive thousands of EPSPs from different neurons, and responds by triggering or not triggering an action potential.This addition and response to the net effect of postsynaptic potentials is called

Accepted Answer

A)  temporal summation.
B)  neural summation.
C)  spatial summation.
D)  neuronal coding.
E)  recruitment.F) B) and E)
G) A) and C)

Question 19

Most metabolic and regulatory functions in a neuron happen at the

Accepted Answer

A)  axon.
B)  soma.
C)  dendrites.
D)  axon hillock.
E)  Schwann cell.F) B) and C)
G) A) and B)

Question 20

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

Accepted Answer

A) True 
 B)False

Exam 12: Nervous Tissue

Presynaptic inhibition is the opposite of

Correct AnswerverifiedE

When the voltage of a plasma membrane shifts from +35mV towards 0 mV, we say the cell is

Correct AnswerverifiedShow Answer

This image shows an action potential.What does "6" represent?

Correct AnswerverifiedB

Accumulation of Ca₂+ in the synaptic knob is called , and probably plays an important role in .

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Which of these happens first in an adrenergic synaptic transmission?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Ependymal cells line the inner cavities of the CNS.

Correct AnswerverifiedShow Answer

Local potentials are , meaning they vary in magnitude according to the strength of the stimulus.

Correct AnswerverifiedShow Answer

Conduction speed of a nerve fiber would be the fastest in a

Correct AnswerverifiedShow Answer

While the membrane is depolarizing its

Correct AnswerverifiedE

The division tends to prepare the body for action.

Correct AnswerverifiedShow Answer

are examples of effectors of the nervous system.

Correct AnswerverifiedShow Answer

are the primary site for receiving signals from other neurons.

Correct AnswerverifiedShow Answer

A cholinergic synapse employs as its neurotransmitter.

Correct AnswerverifiedShow Answer

This image shows a representative neuron.What does "1" represent?

Correct AnswerverifiedShow Answer

An inhibitory local potential

Correct AnswerverifiedShow Answer

A neuron can receive thousands of EPSPs from different neurons, and responds by triggering or not triggering an action potential.This addition and response to the net effect of postsynaptic potentials is called

Correct AnswerverifiedShow Answer

Most metabolic and regulatory functions in a neuron happen at the

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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E

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B

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E

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