Q5.9.Suppose a neuron was at rest around-65 mV when it was exposed to a neurotra
ID: 183730 • Letter: Q
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Q5.9.Suppose a neuron was at rest around-65 mV when it was exposed to a neurotransmitter that caused the neuron to hyperpolarize. Which of the following could be the effect of the neurotransmitter? (Assume the equilibrium potential for K" is-86 mV and for Na" is 50 mV.) The It increased K+ conductance It opened Na+ channels O It produced an inward flow of positive ions and increased membrane potential, V It increased the amount of positive charge in the neuron (ie, charge became more positive) Q5.10. Suppose a neuron has a "gap" in its axon-a region with no voltage-gated Na" or K channels. Which statement below is TRUE The action potential can move past this region as long as the neuron adds K' channels to the gap The action potential can move past this region as long as the depolarization at one end spreads far enough to open sufficient Na channels at the other end e is no way that an action potential can move past such a gap because Na* channels must be right next to each other to sense changes in V The action potential can depolarize the whole length of the axon, however, the lack of K' channels in the gap would result in the neuron returning to its resting potential very slowlyExplanation / Answer
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Answer 5.9: Choice 2 (During hyperpolarization, the membrane potential of the neuron is re-established to highly negative value due to rapid opening of sodium ions. The sodium ions move outside the neuron and thus the net membrane potential of the neuron becomes negative causing hyperpolarization. This causes re-establishment of the nervous potential so that the imuplse might be transmitted to next neuron)
Answer 5.10: Choice 2 (the action potential is definitely passed from one neuron to another due to transmission of sodium ion-mediated impulse and action potential. Thus, the wave of depolarization might pass from one neuron to another due to local potential difference across the membrane of the neuron and thus pass the signal from one neuron to another)
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