Refer to the following graph of an action potential to answer the question.

Which Roman numeral in the graph indicates when the neuronal membrane is at its resting potential?

Question

Refer to the following graph of an action potential to answer the question.

Which Roman numeral in the graph indicates when the neuronal membrane is at its resting potential?

BlackTom AI · Accepted Answer

Begin by identifying what resting potential means in an action potential graph: it is the stable, baseline membrane potential when the neuron is not actively transmitting signals, typically around -70 mV. 
Option I: This label appears near the initial segment of the curve, corresponding to the small initial depolarization before the rapid rise. It does not represent the stable resting state, so this choice is incorrect. 
Option II: This mark aligns with the peak of the action potential, where the membrane is most depolarized (about +30 to +35 mV). Since resting potential is the baseline, not the peak, II is not correct. 
Option III: This label sits along the plateau or after the peak, not at the baseline. It does not indicate the resting state, so III is incorrect. 
Option IV: This label corresponds to the trough after repolarization, when the membrane briefly becomes more negative than the resting potential (hyperpolarization) before settling back to baseline. Although it is close to the resting potential, the standard resting potential is represented by the baseline level, which is indicated by V in this graph. Therefore, IV is not the resting potential. 
Option V: This mark aligns with the baseline membrane potential, the stable state when no action potential is occurring. It matches the typical resting potential around -70 mV and is consistent with the graph’s horizontal resting level. Consequently, V correctly denotes resting potential. 
In summary, the resting potential is the steady, baseline level of membrane potential, which the graph marks as V, while the other Roman numerals correspond to depolarization (I, II) or hyperpolarization/return to baseline (III, IV).

Bio 93 Section CDE 2025 Final Exam Practice, Part 1

Refer to the following graph of an action potential to answer the question. Which Roman numeral in the graph indicates when the neuronal membrane is at its resting potential?

查看解析

登录即可查看完整答案

类似问题

For a neuron with an initial membrane potential at -70 mV, what would be the result of an increase in the movement of potassium ions out of that neuron's cytoplasm?

An increase in extracellular K+ concentration can lead to depolarization of the plasma membrane

The inside of a cell is generally more positively charged compared to the outside

The electrochemical gradient across a cell membrane typically favors the influx of sodium ions into the cell

You make a mutation in the Na+/K+ pump such that it now transports 3 K+ ions into the cell instead of two. What will be the consequence of this mutation?

A change in the axon membrane potential from -70 mV to -90 mV would be termed a(n) _____

The difference in electrical charge between the inside and the outside of the axon membrane is defined as the _______ potential.

更多留学生实用工具

考试浏览器助手

风格化写作助手

论文查重助手

文献引用助手

课堂转译助手

课堂笔记助手

Quiz搜索助手

学校历年真题

智能刷题助手

智能匹配练习

希望你的学习变得更简单