When the threshold of voltage-gated channels is reached and voltage-gated channels open, the resulting change in membrane potential is known as a(n) transition state. induction mode. graded potential. action potential.

Action potential.

Explanation:

Action potential may be defined as the change of the membrane potential of the cell with response to the stimulus. The different ions enter and exit the cells.

Action potential generates in the cell when the threshold voltage - gated channel reaches and opens the voltage gate channel. The opening of voltage gated channel changes the membrane potential of the cell.

Thus, the correct answer is option (4).

it has one origin of replication, but it proceeds in two directions - d)

condenser is used to focus in the light microscope.