The steps of the action potential are listed below. a. the nerve impulse moves down the axon. b. the inside of the membrane becomes positive, and the outside becomes negative. c. a stimulus is received by the dendrites. d. the membrane has a resting potential that is positive on the outside and negative on the inside. which of the following lists the steps in the correct order? 1.) a, b,c, d 2.) d, c,b, a 3.) b, c,a, d 4.) d, a,b, c

c

Explanation:

3. B , C, A, D

Explanation:

Action potential is the stage when the resting potential of the neural membrane disturbs. The membrane voltage is changes from - 70 Mv to

+ 40Mv.

This occurs when there is an impulse transmission occurs from outer environment to the neurons. The stimuli enters by the dendrites and moves to the axons. It disturbs the ions of inner membrane.

As a result the positive sodium ions, present outside the membrane enters inside. Thus the the inside environment is more positive. Then the potassium ions pumped out of the membrane by sodium - potassium pump.

The inside and outside membrane potential is now achieved. But after some time the membrane tends to retain its original condition and the sodium passes out of the cell membrane. Thus the outside of the membrane is more positive charge.

To maintain an equilibrium state the potassium ions again enters into the neural membrane and resting potential is achieved.

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