BIO 181 (Capco ASU) Exam 3 (Final Exam) Already Graded A+
T/F Excitatory synapses cause hyperpolarization of post-synaptic cells.
False
The resting potential of neurons is:
-60 mv (The answer is not on this list.)
T/F The autonomic nervous system contains the sympathetic and the parasympathe...
BIO 181 (Capco ASU) Exam 3 (Final Exam) Already
Graded A+
T/F Excitatory synapses cause hyperpolarization of post-synaptic cells.
False
The resting potential of neurons is:
-60 mv (The answer is not on this list.)
T/F The autonomic nervous system contains the sympathetic and the
parasympathetic nervous system.
True
In the motor end plate, the event that is the immediate trigger for exocytosis is:
Calcium Ions
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.
The action potential is:
A result of the movement of ions.
T/F The cell body refers to the part of the neurons that begin at the dendrites and
extend to the axon terminal.
False
T/F When the presynaptic cell contacts a muscle cell, the synapse area is called a
motor end plate.
True
The post-synaptic cell can be:
In glands, muscle cells, neurons
T/F Excitatory synapses cause depolarization of the post-synaptic cell.
True
T/F Only pre-synaptic neurons are coated with myelin.
False
T/F 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
T/F The axon from a pre-synaptic cell contacts the axon of another neuron.
False
List the 4 types of glial cells and list a phrase to describe their function.
- Microglia: Are part of the cellular immune system to protect the brain since the
humoral immune system usually cannot cross the BB barrier.
- Astrocytes: Contribute to the blood brain barrier
- Schwann Cells: myelinates axons of the neurons in the PNS
- Oligodendrocytes: Myelinates axons of the neurons of the CNS
The central nervous system (CNS) contains:
Brain and Spinal Cord (There is no correct answer).
T/F Fast neurons as described in lecture require cytoplasmic signal transduction
to open an ion channel.
, False
T/F Acetylcholine esterase breaks acetylcholine into muscarinic acid
False
T/F The membrane potential (resting potential) is largely set by the Na-K- ATPase
pump.
True
T/F The receptors in post-synaptic cells are the basis on which the synapse can
be defined as inhibitory or excitatory.
False
T/F
The axon hillock in the pre-synaptic neuron fires based on temporal and spatial
summation of inputs.
True
T/F
Voltage-gated ion channels open when a protein binds to the receptor.
False
The neural tissues are:
Spinal cord, sensory neurons, and brain
T/ F Receptors are made from membrane-bound polyribosomes.
True
Draw a neuron, and label all the parts as described in lecture.
Briefly explain why the action potential flows only from the axon hillock to the
terminal web.
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.
T/F Acetylcholine exocytosed from the presynaptic cell travels to the
postsynaptic cell to start the action potential in the postsynaptic cell.
True
How do the glial cells (i.e., myelin sheath) speed up the firing of neurons?
The cell wraps extensions of a fatty insulating substance (myelin) around the axons of
neurons which increase the speed because the action potential jumps from each node
of ranvier rather than going down the entire length and firing each Na+K+ pump.
The terminal web:
Is a site of exocytosis
T/F Potassium ions are at high concentrations inside of cells including in
neurons.
True
T/F Excitatory synapses make the post-synaptic cell less likely to fire.
False
T/F Vitamin D is synthesized from cholesterol
True
When epinephrine is released it triggers activation of which part of the Autonomic
Nervous System?
Sympathetic Nervous System.
T/F Insulin is produced by alpha cells.
False
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