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ASU BIO 181 Exam 3 (Answered) 100% Correct. 100 Q&A.
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ASU BIO 181 Exam 3 (Answered) 100%Correct. 100 Q&A.
Excitatory synapses make the post-synaptic cell less likely to fire.
False
The neural tissues are:
Spinal cord, sensory neurons, and brain
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.
The action potential is:
A result of the movement of ions.
Receptors are made from membrane-bound polyribosomes.
True
List the 4 types of glial cells and list a phrase to describe their function.
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.
True
When the presynaptic cell contacts a muscle cell, the synapse area is called a motor end plate.
True
Potassium ions are at high concentrations inside of cells including in neurons.
True
The membrane potential (resting potential) is largely set by the Na-K- ATPase pump.
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.
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
Voltage-gated ion channels open when a protein binds to the receptor.
False
The cell body refers to the part of the neurons that begin at the dendrites and extend to the axon
terminal.
False
Only pre-synaptic neurons are coated with myelin.
False
The post-synaptic cell can be:
In glands, muscle cells, neurons
Fast neurons as described in lecture require cytoplasmic signal transduction to open an ion channel.
False
Acetylcholine esterase breaks acetylcholine into muscarinic acid
False
Excitatory synapses cause hyperpolarization of post-synaptic cells.
False
Excitatory synapses cause depolarization of the post-synaptic cell.
True
The axon hillock in the pre-synaptic neuron fires based on temporal and spatial summation of inputs.
True
The receptors in post-synaptic cells are the basis on which the synapse can be defined as inhibitory or
excitatory.
False
The resting potential of neurons is:
The answer is not on this list
Draw a neuron, and label all the parts as described in lecture.
The central nervous system (CNS) contains:
There is no correct answer
The terminal web:
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