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Anatomy Exam 3

QuestionAnswer
During which phase of an action potential are voltage-gated K+ channels open, while voltage-gated Na+ channels are closed? Repolarizing phase
All gated Na+ and K+ channels are closed Resting State (First stage)
Na+ channels open, allowing Na+ entry Depolarization (Second stage)
Na+ channels are inactivating. K+ channels open, allowing K+ to exit. Repolarization (Third stage)
Some K+ channels remain open, and Na+ channels reset Hyperpolarization (Fourth stage)
Which statement best describes the role of leakage (nongated) channels? Leakage channels help maintain the resting membrane potential.
Which of the following best describes the all-or-none phenomenon? An action potential occurs completely when threshold is met and does not happen at all if threshold is not met.
A stimulus that fails to generate an action potential is called a ________. subthreshold stimulus
All voltage-gated Na+ and K+ channels are closed during which of the following stages? The resting state of a neuron
A neuron will not respond to a second stimulus of equal strength to the first stimulus to which it has already responded because __________. the neuron is in the refractory period
Saltatory conduction refers to _______. a conduction process in myelinated axons where the electrical signal appears to jump from gap to gap along the axon
Multiple sclerosis is __________. an autoimmune disease that leads to destruction of the myelin sheaths in the CNS
Which of the following describes a change of membrane potential from -70mV to -75mV? Hyperpolarization
Excessive potassium efflux as a result of relatively slower closure of the potassium gates corresponds to what part of an action potential curve? The hyperpolarization phase of an action potential
How can the central nervous system determine whether a particular stimulus is intense or weak? Stronger stimuli generate action potentials more frequently than weaker stimuli.
Which of the following membrane ion channels open and close in response to changes in the membrane potential? Voltage-gated channels
Created by: addisonh2004
 

 



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