NEET PG DENTAL EXAM

Detailed explanation-1: -The threshold potential is usually around-50 to-55 mV. It is important to know that the action potential behaves upon the all-or-none law. This means that any subthreshold stimulus will cause nothing, while threshold and suprathreshold stimuli produce a full response of the excitable cell.

Detailed explanation-2: -Threshold. Definition: The membrane voltage that must be reached in an excitable cell (e.g., neuron or muscle cell) during a depolarization in order to generate an action potential. At the threshold voltage, voltage-gated channels become activated.

Detailed explanation-3: -Action potentials are only initiated when depolarization above a certain level occurs, this level is known as the ‘threshold potential’. ‘Vm’ is the resting membrane potential (voltage) and the depolarizing stimulus needs to be of great enough magnitude to cause Vm to become more positive than the threshold value.