I know that our physiological cell membrane potential difference is -60mV approximately. However, does this potential difference applies the same to marine cell membrane? Or is there alteration to this potential difference in marine cell membrane?
I guess yes
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC440373/
http://onlinelibrary.wiley.com/doi/10.1113/jphysiol.1961.sp006640/abstract
http://www.sciencedirect.com/science/article/pii/0014482765900212
I'm assuming that we are talking about neurons here. Membrane potential is determined by the distribution of ions across the membrane and the permeability of the membrane to each ion. These are the factors are of greatest importance in establishing membrane potential, not whether it is a neuron from a terrestrial or marine animal.
Kenneth Lohmann actually I'm not concerned about the neuron cells of the marine but all the other cells. As for that point (ion distribution and permeability of the membrane to each ion) why it does not differ from terrestrial or from marine animal while they live under two absolute different environment (isotonic and hypertonic environment)
Thanks for clarifying and sorry I misunderstood your question. I have not worked on membrane voltages of cells that are not neurons, but I would guess that the same principles of physical chemistry would apply to all cells in terms of establishing resting potentials. One important issue is that some marine animals are osmoregulators, meaning that the concentration of ions in their blood differs from the concentration of ions in sea water. Other marine animals are osmoconformers, meaning that the concentration of ions in their blood is nearly identical to that of the surrounding environment. Thus, if the animals that you are interested in are osmoregulators, it might be that the actual concentration of ions in the blood differs from that of the outside environment. In the end, the concentration of ions inside and outside of a cell, as well as the permeability of the cell membrane to each ion, will establish the membrane voltage. If you are interested in the basic principles that underlie this, a neuroscience text discussing the Goldman equation and how resting potentials are established might be useful. I hope this helps. Good luck!
Thank you Kenneth Lohmann your anwer gave me a few ideas to go forth with Thank you again
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