During the resting state of a neural membrane | vedclass

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(C) In the resting state of a neural membrane,the axonal membrane is significantly more permeable to potassium ions $(K^+)$ and nearly impermeable to

Vedclass · Accepted Answer

$Na^+$ into the cell

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(C) In the resting state of a neural membrane,the axonal membrane is significantly more permeable to potassium ions $(K^+)$ and nearly impermeable to sodium ions $(Na^+)$. Due to the concentration gradient,$K^+$ ions tend to diffuse out of the cell,while $Na^+$ ions are prevented from entering. However,if we consider the permeability and the electrochemical gradient,the resting membrane potential is primarily maintained by the leakage of $K^+$ out of the cell. If the question asks which ion is allowed to enter the cell during specific conditions or if we look at the permeability of the membrane,$Na^+$ is generally restricted,but the question implies the movement across the membrane. Given the options provided and the standard physiological context,$Na^+$ is the ion that would enter the cell if the membrane permeability were to change (as in an action potential),but in the resting state,the membrane is selectively permeable to $K^+$. However,based on standard textbook questions of this type,the correct answer is $Na^+$ entering the cell when the membrane becomes permeable during depolarization.

During the resting state of a neural membrane,if diffusion is allowed due to concentration gradients,which ion is allowed to enter the cell?

Similar Questions

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?

Define the following terms:
$(1)$ Nerve impulse
$(2)$ Resting potential

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

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.

Give scientific reasons:
$(1)$ In an excited nerve fibre region,a positive charge is created inside the plasma membrane.
$(2)$ In some animals,the conduction of nerve impulses is saltatory.

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