ASU BIO 181
ASU BIO 181 EXAM 3 Actual Exam Already
Verified Answers Graded A+
Excitatory synapses make the post-synaptic cell less likely to fire. - Correct Ans-False
The neural tissues are: - Correct Ans-Spinal cord, sensory neurons, and brain
How do the glial cells (i.e., myelin sheath) speed up the firing of neurons? - Correct Ans-
The cell wraps extensions of a fatty insulating substance (myelin) around the axons of
neurons.
The action potential is: - Correct Ans-A result of the movement of ions.
Receptors are made from membrane-bound polyribosomes. - Correct Ans-True
List the 4 types of glial cells and list a phrase to describe their function. - Correct Ans-
Microglia: cleans up cellular debris- Astrocytes: support and repair neurons- Schwann
Cells: myelinates axons of the neurons in the PNS- Satellite: form the brain-blood
barrier within the CNS
Acetylcholine exocytosed from the presynaptic cell travels to the postsynaptic cell to
start the action potential in the postsynaptic cell. - Correct Ans-True
When the presynaptic cell contacts a muscle cell, the synapse area is called a motor
end plate. - Correct Ans-True
Potassium ions are at high concentrations inside of cells including in neurons. - Correct
Ans-True
The membrane potential (resting potential) is largely set by the Na-K- ATPase pump. -
Correct Ans-True
Draw an action potential in the axon of a neuron and indicate which ions flow into the
neuron and out of the neuron as the action potential passes at the point where the
electrodes are in the cell. Be sure to assign on the Y-axis the mV of each of these
areas. This should be as described in my lectures. - Correct Ans-
Fast neurons as described in lecture are fast because they are surrounded by a type of
glial cell that results in a myelin coating. - Correct Ans-False
Voltage-gated ion channels open when a protein binds to the receptor. - Correct Ans-
False
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, ASU BIO 181
The cell body refers to the part of the neurons that begin at the dendrites and extend to
the axon terminal. - Correct Ans-False
Only pre-synaptic neurons are coated with myelin. - Correct Ans-False
The post-synaptic cell can be: - Correct Ans-In glands, muscle cells, neurons
Fast neurons as described in lecture require cytoplasmic signal transduction to open an
ion channel. - Correct Ans-False
Acetylcholine esterase breaks acetylcholine into muscarinic acid - Correct Ans-False
Excitatory synapses cause hyperpolarization of post-synaptic cells. - Correct Ans-False
Excitatory synapses cause depolarization of the post-synaptic cell. - Correct Ans-True
The axon hillock in the pre-synaptic neuron fires based on temporal and spatial
summation of inputs. - Correct Ans-True
The receptors in post-synaptic cells are the basis on which the synapse can be defined
as inhibitory or excitatory. - Correct Ans-False
The resting potential of neurons is: - Correct Ans-The answer is not on this list
Draw a neuron, and label all the parts as described in lecture. - Correct Ans-
The central nervous system (CNS) contains: - Correct Ans-There is no correct answer
The terminal web: - Correct Ans-is a site of exocytosis
In the motor end plate, the event that is the immediate trigger for exocytosis is: - Correct
Ans-Calcium ions
The autonomic nervous system contains the sympathetic and the parasympathetic
nervous system. - Correct Ans-True
The axon from a pre-synaptic cell contacts the axon of another neuron. - Correct Ans-
False
Briefly explain why the action potential flows only from the axon hillock to the terminal
web. - Correct Ans-The action potential originates from the axon hillock which initiates
the flow of the action potential because of the presence of higher density voltage-gated
ion channels.
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ASU BIO 181 EXAM 3 Actual Exam Already
Verified Answers Graded A+
Excitatory synapses make the post-synaptic cell less likely to fire. - Correct Ans-False
The neural tissues are: - Correct Ans-Spinal cord, sensory neurons, and brain
How do the glial cells (i.e., myelin sheath) speed up the firing of neurons? - Correct Ans-
The cell wraps extensions of a fatty insulating substance (myelin) around the axons of
neurons.
The action potential is: - Correct Ans-A result of the movement of ions.
Receptors are made from membrane-bound polyribosomes. - Correct Ans-True
List the 4 types of glial cells and list a phrase to describe their function. - Correct Ans-
Microglia: cleans up cellular debris- Astrocytes: support and repair neurons- Schwann
Cells: myelinates axons of the neurons in the PNS- Satellite: form the brain-blood
barrier within the CNS
Acetylcholine exocytosed from the presynaptic cell travels to the postsynaptic cell to
start the action potential in the postsynaptic cell. - Correct Ans-True
When the presynaptic cell contacts a muscle cell, the synapse area is called a motor
end plate. - Correct Ans-True
Potassium ions are at high concentrations inside of cells including in neurons. - Correct
Ans-True
The membrane potential (resting potential) is largely set by the Na-K- ATPase pump. -
Correct Ans-True
Draw an action potential in the axon of a neuron and indicate which ions flow into the
neuron and out of the neuron as the action potential passes at the point where the
electrodes are in the cell. Be sure to assign on the Y-axis the mV of each of these
areas. This should be as described in my lectures. - Correct Ans-
Fast neurons as described in lecture are fast because they are surrounded by a type of
glial cell that results in a myelin coating. - Correct Ans-False
Voltage-gated ion channels open when a protein binds to the receptor. - Correct Ans-
False
1|Page
, ASU BIO 181
The cell body refers to the part of the neurons that begin at the dendrites and extend to
the axon terminal. - Correct Ans-False
Only pre-synaptic neurons are coated with myelin. - Correct Ans-False
The post-synaptic cell can be: - Correct Ans-In glands, muscle cells, neurons
Fast neurons as described in lecture require cytoplasmic signal transduction to open an
ion channel. - Correct Ans-False
Acetylcholine esterase breaks acetylcholine into muscarinic acid - Correct Ans-False
Excitatory synapses cause hyperpolarization of post-synaptic cells. - Correct Ans-False
Excitatory synapses cause depolarization of the post-synaptic cell. - Correct Ans-True
The axon hillock in the pre-synaptic neuron fires based on temporal and spatial
summation of inputs. - Correct Ans-True
The receptors in post-synaptic cells are the basis on which the synapse can be defined
as inhibitory or excitatory. - Correct Ans-False
The resting potential of neurons is: - Correct Ans-The answer is not on this list
Draw a neuron, and label all the parts as described in lecture. - Correct Ans-
The central nervous system (CNS) contains: - Correct Ans-There is no correct answer
The terminal web: - Correct Ans-is a site of exocytosis
In the motor end plate, the event that is the immediate trigger for exocytosis is: - Correct
Ans-Calcium ions
The autonomic nervous system contains the sympathetic and the parasympathetic
nervous system. - Correct Ans-True
The axon from a pre-synaptic cell contacts the axon of another neuron. - Correct Ans-
False
Briefly explain why the action potential flows only from the axon hillock to the terminal
web. - Correct Ans-The action potential originates from the axon hillock which initiates
the flow of the action potential because of the presence of higher density voltage-gated
ion channels.
2|Page
