Question 1

Sodium-potassium pumps are

Accepted Answer

A)  integrators. 
B)  refractory. 
C)  transporters. 
D)  excitatory. 
E)  inhibitory.

Question 2

A neuron normally fires when

Accepted Answer

A)  its sodium-potassium pumps are stimulated. 
B)  there is an EPSP. 
C)  there is an IPSP. 
D)  the degree of depolarization on the axon adjacent to the hillock exceeds the threshold of activation. 
E)  its buttons are stimulated.

Question 3

The fact that the intensity of stimulation is related to the rate of neural firing is attributable to the

Accepted Answer

A)  absolute refractory period. 
B)  relative refractory period. 
C)  voltage gating in the buttons of the neuron. 
D)  sodium-potassium pump. 
E)  ligand gating in the buttons of the neuron.

Question 4

There are two kinds postsynaptic potentials : EPSPS and __________.

Accepted Answer

The answer of There are two kinds postsynaptic potentials :...

Question 5

Drugs that bind to a neurotransmitter's receptors on the postsynaptic membrane without activating them are

Accepted Answer

A)  receptor blockers. 
B)  agonists of the neurotransmitter. 
C)  antagonists of the neurotransmitter. 
D)  both A and B 
E)  both A and C

Question 6

The drug, __________ is a muscarinic antagonist and pupil dilator.

Accepted Answer

The answer of The drug, __________ is a muscarinic antagonist...

Question 7

With respect to neurotransmitters, which of the following is a correct sequence?

Accepted Answer

A)  synthesis, storage, exocytosis, reuptake 
B)  reuptake, synthesis, deactivation, exocytosis 
C)  deactivation, postsynaptic binding, synthesis, storage 
D)  storage, deactivation, synthesis, exocytosis 
E)  exocytosis, postsynaptic binding, synthesis, reuptake

Question 8

Which of the following is synthesized directly from tyrosine?

Accepted Answer

A)  dopamine 
B)  epinephrine 
C)  L-DOPA 
D)  serotonin 
E)  GABA

Question 9

How far do most postsynaptic potentials travel before they die out.

Accepted Answer

A)  to the axon hillock 
B)  to the terminal buttons 
C)  no more than a couple of millimeters 
D)  no more than 50 millimeters 
E)  both B and D

Question 10

The account of neural activity presented in your text book is based to a large degree on the __________ model.

Accepted Answer

The answer of The account of neural activity presented in...

Question 11

Many buttons contain two sizes of vesicles; the larger ones typically contain

Accepted Answer

A)  small-molecule neurotransmitters. 
B)  neuropeptides. 
C)  acetylcholine. 
D)  dopamine. 
E)  glutamate.

Question 12

The process of neurotransmitter release is referred to as

Accepted Answer

A)  excitation. 
B)  exocytosis. 
C)  synthesis. 
D)  metabolism. 
E)  expulsion.

Question 13

This drug is a muscarinic acetylcholine antagonist; it is an extract of the belladonna plant; and it has pupil-dilating effects:

Accepted Answer

A)  atropine. 
B)  curare. 
C)  morphine. 
D)  opium. 
E)  Librium.

Question 14

Neurotransmitter molecules are packaged in vesicles by

Accepted Answer

A)  Golgi complexes. 
B)  ribosomes. 
C)  buttons. 
D)  peptides. 
E)  microtubules.

Question 15

Peptide neurotransmitters are

Accepted Answer

A)  synthesized in the cell body. 
B)  amino acid chains. 
C)  large-molecule neurotransmitters. 
D)  all of the above 
E)  both B and C

Question 16

The finding that antischizophrenic drugs often produce the symptoms of __________ implicated dopamine in the development of schizophrenia.

Accepted Answer

The answer of The finding that antischizophrenic drugs often produce...

Question 17

How are the membrane potentials of neurons recorded? Explain the ionic mechanisms responsible for the resting potential.In your answer, discuss some of the research of Hodgkin and Huxley.

Accepted Answer

The answer of How are the membrane potentials of neurons...

Question 18

Drugs that bind to a neurotransmitter's autoreceptors without activating them are usually

Accepted Answer

A)  agonists. 
B)  antagonists. 
C)  enzymes. 
D)  endorphins. 
E)  amino acids.

Question 19

Many neurons contain and release two neurotransmitters.This situation is called

Accepted Answer

A)  covalence. 
B)  ionotropism. 
C)  cohabitation. 
D)  metabotropism. 
E)  coexistence.

Question 20

Recent technological developments have led to the discovery of __________ throughout the mammalian brain; they seem to be an integral feature of local inhibitory circuits.

Accepted Answer

A)  neuropeptides. 
B)  gap junctions. 
C)  multipolar neurons. 
D)  chemical synapses. 
E)  G-proteins.

Exam 4: Neural Conduction and Synaptic Transmission