Which one of the following elements is needed in the human body to transfer electrical signals by nerve cells?

Lithium

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Sodium

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Rubidium

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Caesium

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Solution

The correct option is D Sodium
Nerve cells present in brain and spinal cord function to transmit and receive signals to and from the body. The sodium is needed in the human body to transfer electrical signals by nerve cells. The sodium-potassium pump triggers an electrical impulse that travels from one nerve cell to the next transmitting messages between brain, spinal cord and the rest of the body.
Thus, the correct answer is 'Sodium.'

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