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In a graded potential, what is the effect of cytoplasmic resistance and current leak?

a) More K+ is able to enter the cell, off-setting the depolarizing effects of Na+.

b) The strength of the signal inside the cell decreases over distance.

c) Fewer Na+ can cross the membrane in response to the stimulus.

d) The outer membrane surface becomes more positively charged, causing hyperpolarization.


Sagot :

(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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