Which of the following ions are required for nerve conduction?

When a neuron is in resting state,$i.e.$,not conducting any impulse,the axonal membrane is

What is the resting membrane potential of a neuron (in millivolts)?

Consider the statements as True/False:
$I$. The axoplasm inside the axon contains a high concentration of $K^{+}$ and negatively charged proteins.
$II$. The axoplasm inside the axon contains a low concentration of $Na^{+}$.
$III$. The fluid outside the axon contains a low concentration of $K^{+}$.
$IV$. The fluid outside the axon contains a high concentration of $Mg^{++}$ and negatively charged proteins.
The correct option is:

The potential difference between the outside and inside of a nerve fiber before excitation is known as:

What is action potential?