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Question

Resting membrane potential ranges from

A
-40mV to -90mV
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B
-70mV to -130mV
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C
-10mV to +30mV
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D
40mV to 90mV
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Solution

The correct option is A -40mV to -90mV
The resting membrane potential (RMP) is created because of a small buildup of negative ions in the axoplasm and an equal buildup of positive ions in the extracellular fluid (ECF). Such a separation of positive and negative charges is a form of potential energy which is measured in volts or millivolts. It ranges from -40mV to -90mV. A typical value is -70mV.
During depolarization, the value may change from -70mV to +30mV. Threshold stimulus to be applied for bringing about depolarization ranges from -55mV to -60mV.
During hyperpolarization, the value may go below -70mV.

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