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ASU BIO 181 Exam 3 Questions with complete Answers 2023
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Exam of 8 pages for the course asu bio 181 at asu bio 181 (ASU BIO 181 Exam 3)
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ASU BIO 181 Exam 3 (13-16)Receptors are made from membrane-bound polyribosomes. - answer True
In the motor end plate, the event that is the immediate trigger for exocytosis is: - answer
Calcium ions
Draw a neuron, and label all the parts as described in lecture. - answer The cell body refers to the part of the neurons that begin at the dendrites and extend to the axon terminal. - answer False
Acetylcholine esterase breaks acetylcholine into muscarinic acid - answer False
List the 4 types of glial cells and list a phrase to describe their function. - answer 1. Schwann Cells: Provides electrical insulation by wrapping around the axon. 2. Oligodendrocytes: Same function for axons in CNS. 3. Astrocytes: Contribute to blood-
brain barrier. 4: Microglia: Protects brain.
The action potential is: - answer A result of the movement of ions
The post-synaptic cell can be: - answer In glands, muscle cells, neurons
Only pre-synaptic neurons are coated with myelin. - answer False
The autonomic nervous system contains the sympathetic and the parasympathetic nervous system. - answer True
The axon hillock in the pre-synaptic neuron fires based on temporal and spatial summation of inputs. - answer True
The neural tissues are - answer Spinal cord, sensory neurons, and brain
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. - answer Briefly explain why the action potential flows only from the axon hillock to the terminal web - answer During the flow of the action potential there is a refractory period that ensures the action potential can't go backwards. This happens via the sodium channels. They only allow positive movement, which allows the action potential to keep flowing forward.
The terminal web: - answer is a site of exocytosis
The axon from a pre-synaptic cell contacts the axon of another neuron. - answer False
The resting potential of neurons is: - answer The answer is not on this list
Fast neurons as described in lecture require cytoplasmic signal transduction to open an ion channel. - answer False
The central nervous system (CNS) contains: - answer There is no correct answer
How do the glial cells (i.e., myelin sheath) speed up the firing of neurons? - answer The glial cells wrap around the axon causing depolarization to happen between the glial
cells.
Acetylcholine exocytosed from the presynaptic cell travels to the postsynaptic cell to start the action potential in the postsynaptic cell. - answer True
Excitatory synapses cause depolarization of the post-synaptic cell. - answer True
Fast neurons as described in lecture are fast because they are surrounded by a type of glial cell that results in a myelin coating. - answer False
Excitatory synapses make the post-synaptic cell less likely to fire. - answer False
Excitatory synapses cause hyperpolarization of post-synaptic cells. - answer False
When the presynaptic cell contacts a muscle cell, the synapse area is called a motor end plate. - answer True
Potassium ions are at high concentrations inside of cells including in neurons - answer True
Voltage-gated ion channels open when a protein binds to the receptor. - answer False
The receptors in post-synaptic cells are the basis on which the synapse can be defined as inhibitory or excitatory. - answer False
The membrane potential (resting potential) is largely set by the Na-K- ATPase pump. - answer True
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