Question 1

What neurotransmitter is used by neurons with cell bodies in the raphe nuclei along the midline of the brainstem?

Accepted Answer

A)  serotonin
B)  dopamine
C)  glycine
D)  GABA

Question 2

Action potentials would be conducted most rapidly by

Accepted Answer

A)  a 10 mm diameter myelinated axon.
B)  a 10 mm diameter unmyelinated axon.
C)  a 40 mm diameter myelinated axon.
D)  a 40 mm diameter unmyelinated axon.

Question 3

Excitotoxicity is caused by

Accepted Answer

A)  insufficient synaptic release of glutamate.
B)  excessive synaptic release of glutamate.
C)  GABA inhibition.
D)  insufficient synaptic release of ACh.

Question 4

Which poison inhibits glycine receptors?

Accepted Answer

A)  strychnine
B)  curare
C)  tetrodotoxin
D)  All of the choices are correct.

Question 5

Benzodiazepines act by increasing ________ activity.

Accepted Answer

A)  GABA
B)  glutamate
C)  ACh
D)  enkephalin

Question 6

Glycine is released at extensor muscles when flexor muscles are contracting.

Accepted Answer

A) True 
 B)False

Question 7

The normal effect of  β\betaβ -endorphin can be blocked by

Accepted Answer

A)  curare.
B)  naloxone.
C)  muscarine.
D)  nicotine

Question 8

Norepinephrine binding to a receptor stimulates the activity of adenylate cyclase.

Accepted Answer

A) True 
 B)False

Question 9

Endocannabinoids are retrograde neurotransmitters,meaning they are

Accepted Answer

A)  released from presynaptic neurons and diffuse to the postsynaptic neuron.
B)  released from postsynaptic neurons and diffuse to the presynaptic neuron.
C)  released from presynaptic neurons and diffuse back to the presynaptic cell body.
D)  None apply.

Question 10

All axons in the PNS have a myelin sheath.

Accepted Answer

A) True 
 B)False

Question 11

Ion channels that open in response to depolarization are called

Accepted Answer

A)  ion-gated channels.
B)  voltage-gated channels.
C)  stimulation-gated channels.
D)  potential-gated channels.

Question 12

The gap of exposed axon in the myelin sheath is the

Accepted Answer

A)  neurilemmA.
B)  node of Ranvier.
C)  sheath of Schwann.
D)  white matter.

Question 13

During an action potential

Accepted Answer

A)  Na+ efflux causes depolarization.
B)  K+ influx causes repolarization.
C)  Na+ influx causes depolarization.
D)  K+ influx causes after-hyperpolarization.

Question 14

A bundle of axons in the CNS is called a/an

Accepted Answer

A)  nerve.
B)  bundle.
C)  tract.
D)  neuron.

Question 15

Which of the following is NOT a type of glutamate receptor?

Accepted Answer

A)  NMDA receptor
B)  muscarinic receptor
C)  kainate receptor
D)  All of the choices are correct.

Question 16

Chemicals that stimulate action potentials in postsynaptic cells are called

Accepted Answer

A)  hormones.
B)  enzymes.
C)  neurotransmitters.
D)  neurotrophins

Question 17

The mesolimbic dopamine neurons arise in the midbrain and terminate in the

Accepted Answer

A)  nucleus accumbens.
B)  corpus striatum.
C)  basal nuclei.
D)  corpus callosum.

Question 18

Botulism toxin prevents release of ACh,causing

Accepted Answer

A)  flaccid paralysis.
B)  hemiplegia.
C)  spastic paralysis.
D)  None apply.

Question 19

Sensory nerves cause muscle contraction.

Accepted Answer

A) True 
 B)False

Question 20

Which of the following is NOT a function of astrocytes?

Accepted Answer

A)  can take up NT from a synapse
B)  can stimulate or inhibit neurons
C)  needed to form synapses in the CNS
D)  phagocytose foreign material in the CNS
E)  form the blood-brain barrier

Exam 7: The Nervous System: Neurons and Synapses

Which of the following is NOT a function of astrocytes?

Correct AnswerverifiedShow Answer

Chemicals that stimulate action potentials in postsynaptic cells are called

Correct AnswerverifiedShow Answer

During an action potential

Correct AnswerverifiedShow Answer

Which of the following is NOT a type of glutamate receptor?

Correct AnswerverifiedShow Answer

Benzodiazepines act by increasing ________ activity.

Correct AnswerverifiedShow Answer

Which poison inhibits glycine receptors?

Correct AnswerverifiedShow Answer

Endocannabinoids are retrograde neurotransmitters,meaning they are

Correct AnswerverifiedShow Answer

Action potentials would be conducted most rapidly by

Correct AnswerverifiedShow Answer

Glycine is released at extensor muscles when flexor muscles are contracting.

Correct AnswerverifiedShow Answer

What neurotransmitter is used by neurons with cell bodies in the raphe nuclei along the midline of the brainstem?

Correct AnswerverifiedShow Answer

Ion channels that open in response to depolarization are called

Correct AnswerverifiedShow Answer

All axons in the PNS have a myelin sheath.

Correct AnswerverifiedShow Answer

The normal effect of β\betaβ -endorphin can be blocked by

Correct AnswerverifiedShow Answer

Norepinephrine binding to a receptor stimulates the activity of adenylate cyclase.

Correct AnswerverifiedShow Answer

The gap of exposed axon in the myelin sheath is the

Correct AnswerverifiedShow Answer

Botulism toxin prevents release of ACh,causing

Correct AnswerverifiedShow Answer

A bundle of axons in the CNS is called a/an

Correct AnswerverifiedShow Answer

Sensory nerves cause muscle contraction.

Correct AnswerverifiedShow Answer

Excitotoxicity is caused by

Correct AnswerverifiedShow Answer

The mesolimbic dopamine neurons arise in the midbrain and terminate in the

Correct AnswerverifiedShow Answer

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The normal effect of $\beta$ -endorphin can be blocked by

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