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BIO201_MH_V3
Topic 11: Functional Organization of Nervous Tissue
Started on Thursday, September 9, 2021, 12:02 PM
State
... [Show More] Finished
Completed on Thursday, September 9, 2021, 12:26 PM
Time taken 23 mins 44 secs
Grade 35.00 out of 35.00 (100%)
Question 1
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When repolarization of a neuron is complete, the
Select one:
a. neuron dies.
b. neuron regenerates.
c. cell no longer has a potential difference across its membrane.
d. original polarity of the neuron is restored.
e. neuron is no longer excitable.
Question 2
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A series of local potentials causes the membrane potential to move to -80 mV. Predict the
result.
Select one:
a. threshold is reached
b. depolarization occurs
c. the neuron is hyperpolarized
d. information of frequency is needed to predict the result
e. the neuron releases neurotransmitter in response
Question 3
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Voltage-gated sodium channels are sensitive to changes in the extracellular concentration
of
Select one:
a. potassium ions.
b. proteins.
c. sodium ions.
d. chloride ions.
e. calcium ions.
Question 4
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Chemical synapses are characterized by
Select one:
a. the release of neurotransmitter by the presynaptic terminal.
b. connexons that connect the pre- and postsynaptic cells.
c. the presence of receptors for neurotransmitters on the presynaptic terminal.
d. the absence of gap junctions.
e. receptors located only on the presynaptic terminal.
Question 5
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When two action potentials arrive simultaneously at two different presynaptic terminals that
synapse with the same postsynaptic neuron,
Select one:
a. the direction of the action potential is reversed.
b. temporal summation occurs.
c. spatial summation occurs.
d. hyperpolarization occurs.
e. threshold is never reached.
Question 6
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Which of the following events is NOT a characteristic of an action potential?
Select one:
a. The plasma membrane becomes highly permeable to sodium ions and depolarization
results.
b. As sodium ions enter, the inside of the plasma membrane becomes more negative.
c. At the peak of depolarization, sodium channels begin to close and potassium channels
open.
d. In repolarization, potassium ions flow out of the cell.
e. Action potentials occur according to the all-or-none principle.
Question 7
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If the ECF around a nerve cell is replaced with an isotonic saline solution that contains
potassium ions and other solutes at concentrations very close to the ECF concentrations of
a normal cell, the result is
Select one:
a. no resting membrane potential.
b. hyperpolarized membrane.
c. depolarized membrane.
d. a resting membrane potential close to its normal value.
e. None of these choices is correct.
Question 8
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Question textIdentify structure "A" on the neuron.
Select one:
a. Schwann cell
b. Node of Ranvier
c. neuron cell body (soma)
d. dendrites
e. axon
Question 9
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The junction of a neuron with another cell is a/an
Select one:
a. synapse.
b. ganglion.
c. receptor.
d. effector.
Question 10
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Identify the type of synapse that includes a presynaptic cell, synaptic cleft, and postsynaptic
cell.Select one:
a. chemical
b. electrical
c. direct
d. indirect
e. neurotransmitter
Question 11
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Which of the following is NOT true about astrocytes?
Select one:
a. They can wall off an injury site to prevent spread of inflammation.
b. They can prevent toxic substances from entering brain tissue.
c. They can release chemicals that promote formation of synapses.
d. They can aid in the regeneration of injured neurons.
Question 12
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Protein synthesis in neurons occurs in
Select one:
a. axons.
b. dendrites.c. cell bodies or soma.
d. terminal boutons.
e. node of Ranvier.
Question 13
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Gaps or interruptions in the myelin sheath are called
Select one:
a. internodes.
b. tight junctions.
c. neurofilaments.
d. nodes of Ranvier.
e. gap junctions.
Question 14
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A neuron that conducts pain sensations to the central nervous system would be classified
as a(n)
Select one:
a. motor neuron.
b. sensory or afferent neuron.
c. efferent neuron.d. association neuron.
e. interneuron.
Question 15
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Hydrocephaly is a condition whereby cerebrospinal fluid accumulates around the
brain. What supportive cells continue CSF production despite it backing up in the
subarachnoid space?
Select one:
a. astrocytes
b. microglial cells
c. oligodendrocytes
d. macrophages
e. ependymal cells
Question 16
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The central nervous system includes the
Select one:
a. ganglia.
b. spinal cord.
c. spinal nerves.
d. cranial nerves.e. sensory receptors.
Question 17
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Cell bodies of the peripheral nervous system are located in
Select one:
a. ganglia.
b. Schwann cells.
c. the motor division.
d. the sensory division.
e. nerves.
Question 18
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There are _____ pairs of cranial nerves and _____ pairs of spinal nerves.
Select one:
a. 10; 30
b. 31; 12
c. 12; 31
d. 30; 10
e. 12; 32
Question 19
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The enteric nervous system consists of plexuses within the walls of the
Select one:
a. brain.
b. spinal cord.
c. digestive tract.
d. urinary bladder.
Question 20
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The autonomic nervous system
Select one:
a. stimulates skeletal muscle contractions.
b. has two sets of neurons in a series.
c. is involved in problem solving.
d. is under voluntary control.
e. does not include the central nervous system. [Show Less]