MEDICAL PHYSIOLOGY

Detailed explanation-1: -The all or none principle means that signal transmission between neurons is not dependent on the strength of the stimuli but, rather, only that the initial threshold is met. In other words, neurons will either transmit an impulse over the synapse to the next neuron completely or not at all.

Detailed explanation-2: -There are no big or small action potentials in one nerve cell-all action potentials are the same size. Therefore, the neuron either does not reach the threshold or a full action potential is fired-this is the “ALL OR NONE” principle. Action potentials are caused when different ions cross the neuron membrane.

Detailed explanation-3: -Neurons communicate with each other via electrical events called ‘action potentials’ and chemical neurotransmitters. At the junction between two neurons (synapse), an action potential causes neuron A to release a chemical neurotransmitter.

Detailed explanation-4: -In physiology, the all-or-none law (sometimes the all-or-none principle or all-or-nothing law) is the principle that if a single nerve fibre is stimulated, it will always give a maximal response and produce an electrical impulse of a single amplitude.