You submitted this quiz on Tue 6 May 2014 6:55 PM CDT. You got a score of 6.27 out of 11.00.
Question 1
Damage to the spinal cord could cause impairment of which of the following functions?
Your Answer
Score
Explanation
Voluntary movement of the arms and legs
Correct 0.20 Voluntary movements of the arms and
legs are controlled by motoneurons, which travel through the spinal cord
Speech Inorrect0.00 Speech is localized to the forebrain and brainstem, and would not be impaired
by spinal cord damage.
Perception
Correct 0.20 Damage to the axons of sensory neurons (which project into the spinal
cord could) would affect sensation and also perception.
Homeostasis
Correct 0.20
The spinal cord is important to homeostasis.
Abstract functions
Inorrect0.00
be impaired by spinal cord damage.
Total
Abstract functions are localized in the forebrain, and would not
0.60 / 1.00
Question 2
Damage to the brainstem could cause impairment of which of the following functions?
Your Answer
Score
Explanation
Voluntary movement of the arms and legs
Correct 0.20
Speech Correct 0.20
Perception
Correct 0.20
Homeostasis
Correct 0.20
Abstract function
Total
Correct 0.20
1.00 / 1.00
Question Explanation
The brain stem is involved in all of the functions except for abstract functions.
Question 3
Damage to the forebrain could cause impairment of which of the following functions?
Your Answer
Score
Explanation
Voluntary movement of the arms and legs
Correct 0.20
Speech Correct 0.20
Perception
Correct 0.20
Homeostasis
Correct 0.20
Abstract functions
Total
Correct 0.20
1.00 / 1.00
Question Explanation
The forebrain is involved in all of the listed functions
Question 4
A mutation that led to the degeneration of glial cells could result in which of the following?
Your Answer
Score
Explanation
Neuronal death Correct 0.20
Central-only demyelination
Correct 0.20
Peripheral-only demyelination Correct 0.20
Abnormal development Correct 0.20
None of the above
Total
Correct 0.20
1.00 / 1.00
Question 5
Which of the following are inside (underneath) the arachnoid layer?
Your Answer
Dura
Inorrect0.00
Score
Explanation
Pia
Correct 0.20
Motoneuronal cell bodies
Inorrect0.00
Autonomic ganglion neurons
Inorrect0.00
Neurons of the spinal cord
Inorrect0.00
Total
0.20 / 1.00
Question 6
Within a neuron, information flows in which direction(s)?
Your Answer
Score
Explanation
Dendrites to cell body Inorrect0.00
Cell body to axons
Correct 0.20
Axon to dendrites
Inorrect0.00
Axon to cell body
Inorrect0.00
Axon to synaptic terminal
Total
Correct 0.20
0.40 / 1.00
Question Explanation
Information comes in through the dendrites, to the cell bodies, down the axon to the synaptic terminal.
Question 7
Between neurons, information flows in which directions?
Your Answer
Score
Explanation
Synaptic terminal to axon
Correct 0.17
Axon to synaptic terminal
Correct 0.17
Dendrite to synaptic terminal
Inorrect0.00
Synaptic terminal to dendrite
Inorrect0.00
Cell body to dendrite
Inorrect0.00
None of the above
Total
Correct 0.17
0.50 / 1.00
Question 8
There are no more than 100,000 motoneurons and yet these are the only neurons that:
Your Answer
Score
Explanation
Send a process out that leaves the central nervous system
Inorrect0.00
Innervate voluntary muscles such as the quadriceps or biceps
Inorrect0.00
Allow us to express ourselves volitionally
Inorrect0.00
Travel through the spinal cord Inorrect0.00
Have dendrites Inorrect0.00
None of the above
Total
Correct 0.17
0.17 / 1.00
Question 9
Which of the following are true of myelin?
Your Answer
Score
Explanation
It covers all axons in the central nervous system Inorrect0.00 While the vast majority of neurons are
myelinated, a subset of sensory neurons known as C fibers are not.
It covers some of the axons in the peripheral nervous system
neurons are myelinated.
Inorrect0.00
The majority of human
It changes the speed at which action potentials travel down an axon, increasing the speed in some axons
and decreasing it in others
Correct 0.20 Carefully read this option, and think about the purpose
and function of myelin.
Losing myelin will increase the conduction velocity of action potentials Inorrect0.00
this option, and think about the purpose and function of myelin.
None of the above
Total
Correct 0.20
0.40 / 1.00
Question Explanation
At least one of these options is correct.
Carefully read
Myelin is wrapped around the axon of some neurons and increases the speed of action potential
conduction.
Question 10
An intracranial tumor is least likely to be made up of which type of cells?
Your Answer
Score
Explanation
Lung Inorrect0.00 Lung cancer often metastasizes to the brain. Secondary (meaning originating
elsewhere) brain tumors are actually the most common type of tumor to find in the intracranial cavity.
Arachnoid
Correct 0.20 Arachnoid cells are a type of meningeal cell, which produce a relatively
common type of benign brain tumor known as a meningioma.
Pituitary cells
Inorrect0.00
Pituitary tumors are a common type of brain tumor.
Astrocytes
Inorrect0.00 Astrocytes are glial cells. Gliomas are the most common primary
(meaning originating at the site of the tumor) brain tumor.
Neurons
Inorrect0.00
Total
0.20 / 1.00
Question Explanation
Neurons are rarely the source of tumors because they are no longer able to divide.
Question 11
You discover a new toxin which, like most toxins, is a large molecule that can reach peripheral neurons
but cannot cross the meninges on its own. Which of the following symptoms may result from exposure
to this toxin?
Your Answer
Score
Explanation
Depression
Correct 0.20 Depression depends only on neurons of the central nervous system, and
would not be affected by a disease of the peripheral nervous system
Paralysis of voluntary muscles Correct 0.20 Motoneurons that project to voluntary (skeletal)
muscles synapse on the muscle in the periphery and thus could be affected by a peripheral toxin
Dry mouth due to lack of salivation
Correct 0.20
that end on glands, all in the periphery.
Salivation requires autonomic ganglion neurons
Amnesia
Correct 0.20 Memory depends only on neurons of the central nervous system, and
would not be affected by a disease of the peripheral nervous system
Constipation due to gut immobility
Inorrect0.00 Gut mobility requires peripheral autonomic
ganglion neurons, which could be impaired by the new toxin.
Total
0.80 / 1.00
Question Explanation
The toxin can only access neuronal cell bodies or synaptic terminals that are present peripherally. With
an exception, the central nervous system will not be affected by the toxin. The exception is that
motoneurons (that innervate skeletal muscle for volitional movement) and autonomic motor neurons
(that innervate autonomic ganglia neurons which in turn innervate glands, cardiac or smooth muscle)
may take up a toxin in the periphery and transport it back to the cell body that is located centrally. This
happens with polio.