Bio 181 ASU Module 13-14 question &
answers 2022
The resting potential of neurons is:
a. 0 mV
b. Same as the action potential
c. Always a positive value
d. Two of the above
e. The answer is not on this list - e. The answer is not on this list
True/False
The axon from a pre-synaptic cell contacts the axon of another neuron. - false
True/False
Excitatory synapses cause depolarization of the post-synaptic cell. - true
In the motor end plate, the event that is the immediate trigger for exocytosis is:
a. Potassium ions
b. Chloride ions
c. Calcium ions
d. The action potential
e. The cell body - c. Calcium ions
True/False
The receptors in post-synaptic cells are the basis on which the synapse can be defined
as inhibitory or excitatory. - false
True/False
Excitatory synapses make the post-synaptic cell less likely to fire. - false
The central nervous system (CNS) contains:
a. Nerves extending from the spinal column to the fingers
b. Motor neurons extending from the spinal column to the fingers
c. Only the brain
d. Two of the above
e. There is no correct answer - e. There is no correct answer
True/False
Fast neurons as described in lecture are fast because they are surrounded by a type of
glial cell that results in a myelin coating. - false
True/False
Acetylcholine exocytosed from the presynaptic cell travels to the postsynaptic cell to
start the action potential in the postsynaptic cell. - true
, The terminal web:
a. is in the dendrites
b. is the site where exocytosis occurs
c. is at the axon hillock
d. is a site of exocytosis
e. This list contains no correct answers - d. is a site of exocytosis
List the 4 types of glial cells and list a phrase to describe their function. - 1. Schwann
cells wrap around axons of a neuron in the PNS, providing electrical insulation
2. Oligodendrocytes do the same thing as schwann cells but they do it in the CNS
3. Astrocytes are star-shaped cells that contribute to blood-brain barrier and protect the
brain from toxic chemicals
4. Microglia cells are part of the cellular immune system to protect the brain
How do the glial cells (i.e., myelin sheath) speed up the firing of neurons? - Glial cells
allows the chemistry of the axon to jump down the axon, using nodes of ranvier, instead
of having to occur at every micrometer of the length of the axon
The post-synaptic cell can be:
a. In glands, muscle cells, neurons
b. are only neurons
c. have only chemical synapses
d. have only electrical synapses
e. This list contains no correct answers - a. In glands, muscle cells, neurons
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. -
True/False
The cell body refers to the part of the neurons that begin at the dendrites and extend to
the axon terminal. - false
True/False
The autonomic nervous system contains the sympathetic and the parasympathetic
nervous system. - true
True/False
Only pre-synaptic neurons are coated with myelin. - false
True/False
Potassium ions are at high concentrations inside of cells including in neurons. - true
The neural tissues are:
answers 2022
The resting potential of neurons is:
a. 0 mV
b. Same as the action potential
c. Always a positive value
d. Two of the above
e. The answer is not on this list - e. The answer is not on this list
True/False
The axon from a pre-synaptic cell contacts the axon of another neuron. - false
True/False
Excitatory synapses cause depolarization of the post-synaptic cell. - true
In the motor end plate, the event that is the immediate trigger for exocytosis is:
a. Potassium ions
b. Chloride ions
c. Calcium ions
d. The action potential
e. The cell body - c. Calcium ions
True/False
The receptors in post-synaptic cells are the basis on which the synapse can be defined
as inhibitory or excitatory. - false
True/False
Excitatory synapses make the post-synaptic cell less likely to fire. - false
The central nervous system (CNS) contains:
a. Nerves extending from the spinal column to the fingers
b. Motor neurons extending from the spinal column to the fingers
c. Only the brain
d. Two of the above
e. There is no correct answer - e. There is no correct answer
True/False
Fast neurons as described in lecture are fast because they are surrounded by a type of
glial cell that results in a myelin coating. - false
True/False
Acetylcholine exocytosed from the presynaptic cell travels to the postsynaptic cell to
start the action potential in the postsynaptic cell. - true
, The terminal web:
a. is in the dendrites
b. is the site where exocytosis occurs
c. is at the axon hillock
d. is a site of exocytosis
e. This list contains no correct answers - d. is a site of exocytosis
List the 4 types of glial cells and list a phrase to describe their function. - 1. Schwann
cells wrap around axons of a neuron in the PNS, providing electrical insulation
2. Oligodendrocytes do the same thing as schwann cells but they do it in the CNS
3. Astrocytes are star-shaped cells that contribute to blood-brain barrier and protect the
brain from toxic chemicals
4. Microglia cells are part of the cellular immune system to protect the brain
How do the glial cells (i.e., myelin sheath) speed up the firing of neurons? - Glial cells
allows the chemistry of the axon to jump down the axon, using nodes of ranvier, instead
of having to occur at every micrometer of the length of the axon
The post-synaptic cell can be:
a. In glands, muscle cells, neurons
b. are only neurons
c. have only chemical synapses
d. have only electrical synapses
e. This list contains no correct answers - a. In glands, muscle cells, neurons
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. -
True/False
The cell body refers to the part of the neurons that begin at the dendrites and extend to
the axon terminal. - false
True/False
The autonomic nervous system contains the sympathetic and the parasympathetic
nervous system. - true
True/False
Only pre-synaptic neurons are coated with myelin. - false
True/False
Potassium ions are at high concentrations inside of cells including in neurons. - true
The neural tissues are:
