AP PSYCHOLOGY

Detailed explanation-1: -The minimum stimulus required to trigger an action potential is known as the threshold stimulus. In order for an action potential to be produced, a stimulus (or combination of stimuli) must depolarize to the membrane from-70 mV to the threshold potential of-55 mV.

Detailed explanation-2: -The neural threshold is the minimum amount of stimulation needed to fire a neuron.

Detailed explanation-3: -Threshold of excitation(threshold): The level that a depolarization must reach for an action potential to occur. In most neurons the threshold is around-55mV to-65mV.

Detailed explanation-4: -The threshold is the value of the membrane potential which, if reached, leads to the all-or-nothing initiation of an action potential. The initial or rising phase of the action potential is called the depolarizing phase or the upstroke.

Detailed explanation-5: -Threshold depolarization is defined as the amplitude of the depolarization that will just bring a neurone to its firing threshold. Here, a novel technique is described for the measurement of threshold depolarization in resting human motoneurones.