Question 1

A stimulus traveling toward a synapse appears to open calcium ion channels at thepresynaptic end, which in turn promotes fusion of synaptic vesicles to the axonal membrane.

Accepted Answer

A) True 
 B)False

Question 2

Imagine a neuron that has several hundred axonal knobs impinging on it. The majority of these axonal knobs are shown to be "firing." However, the neuron in question does not transmit an impulse. Give a valid explanation of why this could occur.

Accepted Answer

The answer of Imagine a neuron that has several hundred...

Question 3

Which ion channel opens in response to a change in membrane potential and participates in the generation and conduction of action potentials?

Accepted Answer

A)  voltage-gated channel 
B)  ligand-gated channel 
C)  leakage channel 
D)  mechanically gated channel

Question 4

Enkephalins and endorphins are peptides that act like morphine.

Accepted Answer

A) True 
 B)False

Question 5

Which of the following describes the nervous system integrative function?

Accepted Answer

A)  analyzes sensory information, stores information, makes decisions 
B)  senses changes in the environment 
C)  responds to stimuli by gland secretion or muscle contraction

Question 6

An inhibitory postsynaptic potential (IPSP) is associated with ________.

Accepted Answer

A)  opening of voltage-regulated channels 
B)  lowering the threshold for an action potential to occur 
C)  hyperpolarization 
D)  a change in sodium ion permeability

Question 7

Which of the following is not a chemical class of neurotransmitters?

Accepted Answer

A)  ATP and other purines 
B)  nucleic acid 
C)  amino acid 
D)  biogenic amine

Question 8

A postsynaptic potential is a graded potential that is the result of a neurotransmitter released into the synapse between two neurons.

Accepted Answer

A) True 
 B)False

Question 9

When a neurotransmitter like GABA is acting in an inhibitory manner which of the following is likely a result of the GABA acting on the post synaptic cell?

Accepted Answer

A)  depolarization of the postsynaptic cell membrane 
B)  influx of positively charged ions into the postsynaptic cell 
C)  hyperpolarization of the postsynaptic cell membrane 
D)  opening of chemically gated sodium channels

Question 10

Which of the following is not a function of astrocytes?

Accepted Answer

A)  support and brace neurons 
B)  provide the defense for the CNS 
C)  guide the migration of young neurons, synapse formation, and helping to determine capillary permeability 
D)  anchor neurons to blood vessels

Question 11

A second nerve impulse cannot be generated until________.

Accepted Answer

A)  the Na ions have been pumped back into the cell 
B)  the membrane potential has been reestablished 
C)  proteins have been resynthesized 
D)  all sodium gates are closed

Question 12

Collections of nerve cell bodies outside the central nervous system are called________.

Accepted Answer

A)  ganglia 
B)  nuclei 
C)  nerves 
D)  tracts

Question 13

Which of the following correctly describes a graded potential?

Accepted Answer

A)  it travels long distances 
B)  it has a depolarization, repolarization and hyperpolarization phase 
C)  it can have amplitudes of various sizes 
D)  it is initiated by voltage changes in the membrane

Question 14

Which of the following neurotransmitters inhibits pain and is mimicked by morphine, heroin, and methadone?

Accepted Answer

A)  endorphin 
B)  acetylcholine 
C)  serotonin 
D)  nitric oxide

Question 15

The term central nervous system refers to the ________.

Accepted Answer

A)  brain and spinal cord 
B)  spinal nerves 
C)  somatic nerves 
D)  sensory (afferent) nerves

Question 16

The concentration neurotransmitters in the fluid of the synaptic cleft must be tightly regulated for neurons to function properly. Which of the following cells is most responsible for aiding in this regulation?

Accepted Answer

A)  satellite cells 
B)  astrocytes 
C)  Schwann cells 
D)  oligodendrocytes

Question 17

When a sensory neuron is excited by some form of energy, the resulting graded potential is called a(n) ________.

Accepted Answer

A)  postsynaptic potential 
B)  excitatory potential 
C)  generator potential 
D)  action potential

Question 18

Which of the following is true about the movement of ions across excitable living membranes?

Accepted Answer

A)  Ions always move passively across membranes. 
B)  Ions always move actively across membranes through leakage channels. 
C)  Ions always move from an area of higher concentration to an area of lower concentration. 
D)  Sodium gates in the membrane can open in response to electrical potential changes.

Question 19

Nerve impulses leading to the brain carry information about cool temperatures on the skin.The nerve fibers sending these signals will most likely belong to which division of the nervous system?

Accepted Answer

A)  sensory (afferent) division 
B)  somatic nervous system 
C)  sympathetic division 
D)  parasympathetic division

Question 20

Because all action potentials are alike, how does the brain separate situations that require immediate attention from ordinary "positional" reports?

Accepted Answer

The answer of Because all action potentials are alike, how...

Exam 11: Fundamentals of the Nervous System and Nervous Tissue

A stimulus traveling toward a synapse appears to open calcium ion channels at thepresynaptic end, which in turn promotes fusion of synaptic vesicles to the axonal membrane.

Imagine a neuron that has several hundred axonal knobs impinging on it. The majority of these axonal knobs are shown to be "firing." However, the neuron in question does not transmit an impulse. Give a valid explanation of why this could occur.

Which ion channel opens in response to a change in membrane potential and participates in the generation and conduction of action potentials?

Enkephalins and endorphins are peptides that act like morphine.

Which of the following describes the nervous system integrative function?

An inhibitory postsynaptic potential (IPSP) is associated with ________.

Which of the following is not a chemical class of neurotransmitters?

A postsynaptic potential is a graded potential that is the result of a neurotransmitter released into the synapse between two neurons.

When a neurotransmitter like GABA is acting in an inhibitory manner which of the following is likely a result of the GABA acting on the post synaptic cell?

Which of the following is not a function of astrocytes?

A second nerve impulse cannot be generated until________.

Collections of nerve cell bodies outside the central nervous system are called________.

Which of the following correctly describes a graded potential?

Which of the following neurotransmitters inhibits pain and is mimicked by morphine, heroin, and methadone?

The term central nervous system refers to the ________.

The concentration neurotransmitters in the fluid of the synaptic cleft must be tightly regulated for neurons to function properly. Which of the following cells is most responsible for aiding in this regulation?

When a sensory neuron is excited by some form of energy, the resulting graded potential is called a(n) ________.

Which of the following is true about the movement of ions across excitable living membranes?

Nerve impulses leading to the brain carry information about cool temperatures on the skin.The nerve fibers sending these signals will most likely belong to which division of the nervous system?

Because all action potentials are alike, how does the brain separate situations that require immediate attention from ordinary "positional" reports?