membrane potential Definition and 17 Threads

Hello everyone, All living things have a growth cycle in which they gain mass and volume. These elements are obviously and undoubtedly taken from the environment in which these creatures live. Therefore, it is undeniable that the amount of potassium, for example, in the body increases during...

Good evening, I got a seriously problem at understanding the membrane potential for ions in a cell. Particulary, i don't understand the case for example for ions with a charge of 2 or higher. I take a look on two scenarios: If you got an ion like calium and got a concentration ratio of 1:10...

Is it possible to 3d print a neuronal structure with a different material than neurons that would work just like a neuron with membrane potential?

I'm learning about a very basic model neuron, in which only potassium and chloride is permeable. Why is it that when the extracellular concentration of potassium is increased, the neuron become depolarized, whereas when extracellular concentration of chloride is reduced, the neural membrane...

In membrane potential determination of a cell, the Goldman Hodgkin Katz equation says the contribution of an ion to diffusion potential is dependent on its membrane permeability. So in case an ion, one that has a zero permeability, is present outside the cell, using the equation , one will get...

hello world long time no see..actually I've been very confused with this resting membrane potential I've sooo many questions but i'll only ask one question for now .at rest the membrane of nerve cell is permeable to potassium , potassium goes outside the cell along its concentration gradient...

Is there any reason,resting membrane potential is cca -70mV?because teacher asked us today,and it was not enough for him to say,that it is due concentrations of ions...What is the reason of this value? Thanks

Hi, Was wondering if I could get some help with part b of this question? I've attached the question and my attempt in the pictures as there was a lot of data and writing, so thought this would be the easiest way. With my attempt I think I'm missing something pretty obvious, but I'm drawing...

I've just finished reading through the generally well-written Wikipedia article on membrane potential: http://en.wikipedia.org/wiki/Membrane_potential I found almost everything to be clear, but one question is nagging at me. Why do changes in membrane permeability directly affect membrane...

Homework Statement Calculate the membrane potential (Vm) of a cell, given the following resistances and equilibrium potentials (10 marks) E(K) = -80mV, R(K) = 0.2*10^6 ohms, E(Na) = 60mV, R(Na) = 0.2*10^6 ohmsHomework Equations Not sure The Attempt at a Solution In my texts I have read...

Hello everyone, These are true,false questions. I'm on holiday so can't get help yet and this is not homework. 1.Increased permeability of the cell membraneto K+ than Na+ is important for maintaining resting membrane potential of cell? Ok I know this is true but I don't understand...

hi i was wondering if you could help me answering this question please .. "compare between forces that involved in the K+ channel during resting membrane potential and hyperpolrization" ? I'm sorry but i need to know the answer ASAP .. :biggrin:

Hello all. I just had a few conceptual problems if someone wouldn't mind explaining to me. When looking at a simple cell membrane, potassium ions tend to move out of the cell along their concentration gradient until its electrical gradient is strong enough to counterbalance it, thus...

Homework Statement Which of the following is NOT important in determining a neurons membrane potential: The function of the neuron or the location of the neuron? Homework Equations N/a The Attempt at a Solution The function of a neuron is obviously the integration, summation, and...

Homework Statement a biological cell is immersed in a 50mM solution of NaCl at 37C. the cell's membrane is permeable only to Na+ ions. When the system reaches equilibrium, a potential diff of 54.9mV is measured between the inside and the outside of the cell where the inside has the higher(...

This question is the last thing that is bugging me about my basic understanding of a nerve impulse: How can the there be a non-zero voltage across a membrane if the solutions on either side are electrically neutral? It seems like the existence of a gradient should necessitate at least one...

[Chemistry] Another electrochemistry question Homework Statement Given the following half-reactions: Ce4+ + e− → Ce3+ E° = 1.72 V Fe3+ + e− → Fe2+ E° = 0.771 V A solution is prepared by mixing 7.0 mL of 0.30 M Fe2+ with 8.0 mL of 0.12 M Ce4+. Calculate [Ce4+] in the...