Question

Depolarization of a stimulated nerve is maintained
by
(a) Ca⁺⁺ (b) Cl⁻
(c) Mg⁺⁺(d) K⁺

Answer 1

Answer:

OPTION D IS CORRECT  ANSWER .

Explanation:

depolarization means stimulus reaches a resting neuron during depolarization

their are different types of ion channel present on neuron membrane

1. this ion channels are selectively permeable to different ions
2. the change in polarity of across the plasma membrane is known as action potential and the membrane is said as depolarized
3. this result in positive charge inside and negative charge outside
4. during depolarization Na  plus channels open
5. this all activity is controlled by Kplus ions that is potassium
6. hence option d is correct answer

Answer 2

Depolarization of a stimulated nerve is maintained by potassium( K+ ions).

* The membrane when at resting potential has a greater negative charge inside the cell as compared to the exterior.

* Depolarisation is a state of the membrane when it becomes less negative as compared to the resting potential.

This is caused by the flow of positive ions into the cell.

* Hyperpolarisation is just the opposite wherein the membrane becomes more negative.

This is caused by the flow of positive ions out of the cell or negative ions into the cell.