16) Why is it that an action potential cannot reverse and move back towards the
ID: 3504409 • Letter: 1
Question
16) Why is it that an action potential cannot reverse and move back towards the cell body when Na channels open in the middle of the axon causing depolarization to spread both ways a. b. c. There are other ions that prevent the moving back of the action potential Na channels don't open in the middle of the axon The refractory period prevents the AP from going back towards the soma There is an electrical "door" in certain regions of the axon that closes as the AP moves forward The statement is incorrect; AP does travel both ways d. e. 17) Which of the following statements is incorrect with respect to AP traveling in a neuron a. b. c. d. e. The larger an axon the slower it is The higher the temperature the faster it is The presence of myelination makes the conduction faster A and B are incorrect They are all correct 18) What happens to the likelihood of firing an action potential when the ECF K increases? The RMP decreases making it impossible to a neuron to fire an AP The RMP goes more positive and therefore closer to the threshold so a smaller than a. b.Explanation / Answer
Answer 16
c.
because the action potential can only travel in one direction – from the cell body towards the axon terminal – because a patch of membrane that has just undergone one action potential is in a “refractory period” and cannot undergo another.
Answer 18
e.
Because If extracellular potassium concentration increases, then the potassium gradient accross the cell membrane decreases,therefore resting membrane potential will become more positive.
Answer 20
b.
because The removal of neurotransmitter molecules from the synaptic gap is achieved in three ways
diffusion , re-uptake and degradation
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