For visual sense,the nerve impulse is generated by

Regarding the $Na^+ - K^+$ pump:
$(A)$ It transports $3\, Na^+$ ions inside and $2\, K^+$ ions outside.
$(B)$ It maintains the ionic gradient through active transport.
$(C)$ It works against the concentration gradient.
Which of the above statements are incorrect?

The potential difference across the membrane of a relaxed muscle fibre is called resting potential. It amounts to about

In which condition,the axonal membrane is comparatively more permeable to potassium ions and nearly impermeable to sodium ions?

An action potential in a nerve fiber is generated when the $+ve$ and $-ve$ charges on the outside and inside of the axon membrane are reversed because ...........

Which of the following events occur during the repolarization of a nerve fiber?