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?

Question

BlackTom AI · Accepted Answer

To approach this, let's consider what happens when there is an increase in potassium ion (K+) efflux from the neuron's cytoplasm.
Option 1: 'replacement of potassium ions with sodium ions' suggests ions are swapped across the membrane, which is not how membrane potential changes occur in response to increased K+ leak. Ionic exchange like that does not describe the physiological mechanism here.
Option 2: 'hyperpolarization of the neuron' correctly captures the effect. More K+ leaving the cell makes the inside more negative relative to the outside, pulling the membrane potential further away from zero and toward the K+ equilibrium potential, which is a hyperpolarizing shift.
Option 3: 'depolarization of the neuron' would require the inside to become less negative (toward or above 0 mV). Increased K+ efflux does the opposite, so this is not accurate in this context.
Option 4: 'replacement of potassium ions with calcium ions' implies a substitution process that does not describe the actual membrane dynamics of enhanced K+ efflux. Calcium ions do not replace intracellular K+ in this scenario.
In summary, when more potassium leaves the cell, the membrane potential becomes more negative, which aligns with hyperpolarization, while the other options mischaracterize the mechanism or outcome.

Bio 93 Section CDE 2025 Final Exam Practice, Part 1

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?

查看解析

登录即可查看完整答案

类似问题

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?

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