Neural Control and Coordination Question 25
25. In the resting state of the neural membrane, diffusion due to concentration gradients, if allowed, would drive
[2004]
(a) $K^{+}$into the cell
(b) $K^{+}$and $Na^{+}$out of the cell
(c) $Na^{+}$into the cell
(d) $Na^{+}$out of the cell
Show Answer
Answer : c
Hints & Solutions
(c) In a resting state of the neural membrane, $Na^{+}$concentration is higher on the outer side and $K^{+}$concentration is more within the cell. This concentration gradient is maintained by voltage gated channels. Hence if diffusion is allowed $Na^{+}$would enter the cell and $K^{+}$would leave.
