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(b)The strength of the signal inside the cell decreases over a distance
Depolarizing current from an action potential travels very rapidly through the cytoplasm of axons, insulated by myelin until reaching the next node of Ranvier. At each node, the membrane depolarizes above the threshold voltage, and the influx of sodium ions again initiates the action potential through Nav
And those generated by stimuli and sensory receptors are also called receptor potentials. A graded potential like this one, that moves the membrane potential to a less negative number, or closer to zero, is called a depolarization, because now the membrane is less polarised. It has less charge separation.
That is, neurons have a resting membrane potential (or simply, resting potential) of about −30 mV start text, m, V, end text to −90 mV start function, m, V, end text. Because there is a potential difference across the cell membrane, the membrane is said to be polarised.
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