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Generation of an Action Potential In order - Correct answer ✅-Depolarize: The
membrane potential is becoming more positive than the resting membrane potential.
Repolarize: The membrane potential is moving from a more positive value toward
resting membrane potential.
Hyperpolarize: The membrane potential is more negative than the resting membrane
potential.
Action potentials (nerve impulses) are changes in the membrane potential that, once
started, will affect the entire excitable membrane. The first action potential is usually
generated at the initial segment of the neuron's axon. This activity will test your
understanding of the sequence of events that occur at the membrane of the initial
segment of the axon during generation of an action potential. - Correct answer ✅-1)
Threshold stimulus Na+ channels open
2) Na+ influx Depolarization
3) Na+ channels close K+ channels open
4) K+ efflux Repolarization
pg. 1
,5) Hyperpolarization K+ channels close
Resting Membrane Potential - Correct answer ✅-
Ion Concentrations in the RMP - Correct answer ✅-The Na+ concentration is higher
outside of the cell, while the concentration of K+ is higher inside the cell.
Vocabulary terms - Correct answer ✅-1) Two consecutive neurons communicate at
a synapse, where they physically come together.
2) Supporting cells of the nervous system are collectively called neuroglia.
3) Structures of the nervous system surrounding, but not part of the central nervous
system are part of the peripheral nervous system.
4) When potassium channels have been open long enough to over-shoot resting
membrane potential, hyperpolarization has occurred.
5) endorphins are a group of natural chemicals that reduce the perception of pain.
6) When a neuron is stimulated and sodium channels open, the process of
depolarization has begun.
pg. 2
, In a lab you are conducting tests with various chemicals and neurotransmitter
receptors. You notice that exposed frog muscle cells depolarize when you add the
chemical nicotine to the acetylcholine (ACh) receptors. What does this tell us about
the relationship between neurotransmitters and their receptors? - Correct answer ✅-
The effect of a neurotransmitter is based on the properties of the receptor more than
the neurotransmitter.
Which mechanism allows the rabies virus to gain access to the central nervous system
(CNS)? - Correct answer ✅-The rabies virus uses retrograde movement along the
neuronal axon.
People with multiple sclerosis (MS) experience many challenging symptoms. Which
statement best explains one cause of these difficulties? - Correct answer ✅Loss of
oligodendrocytes in the central nervous system results in absence of the myelin sheath
of neuronal axons, impairing rapid saltatory conduction.
People who have hydrocephaly often have an issue with which of these glial cell
types? - Correct answer ✅Ependymal cells
pg. 3