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Question

Assertion :The imbalance in concentration of Na+, K+ and proteins generates resting potential. Reason: To maintain the unequal distribution of Na+ and K+, the neurons use electrical energy.

A
Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.
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B
Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.
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C
Assertion is correct but Reason is incorrect.
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D
Both Assertion and Reason are incorrect.
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Solution

The correct option is C Assertion is correct but Reason is incorrect.
The resting potential in a nerve cell generates due to an imbalance in the concentration of Na+, K and proteins. At rest there is high concentration of K+ and proteins inside while there is high Na+ concentration outside. This creates a negative charge inside and positive charge outside.
The unequal distribution of Na+ and K+ is maintained by utilizing chemical energy in the form of ATP. It involves the operation of Na+K+ATPase enzyme which is present in the plasma membrane. This pump uses ATP to pump sodium out of cells while pumping potassium into cells, both against their concentration gradients
Therefore, the correct answer is 'Assertion is correct but Reason is incorrect'.

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