"Experiment on the nerve cell. Using a setup like the one shown in Fig. 1, the membrane potential is measured. The sodium concentration in the surrounding fluid is then continuously increased.
Sketch a voltage-time diagram. Hypothesize how increasing sodium concentration might affect the resting potential.
Does anyone of you understand this?
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My questions would be: What is the resting potential and how does it arise? (Please use your own words and not AI) Why are potassium ions in the biomembrane so important for the formation of the resting potential (with explanation)
The membrane potential is an electrical voltage, i.e. represents the distribution of electrical charges on both sides of the cell membrane, i.e. inside and outside the cell. If there are equal numbers of positive or negative charges on both sides, the membrane potential is 0V. If more negative charges are present within the cell than outside, one measures a negative potential, more positive charges are present in the cell, it is correspondingly positive.
Sodium ions are positively charged. So how does it influence the measured membrane potential if more and more sodium ions are added outside the cell?
Well, you should actually do the experiment and measure the tension after different sodium addition.