Nerve Impulse Transmission Animation

How nerves transmit impulses. Stimulation of a nerve occurs at a receptor. Sensory receptors Specialized to specific types of stimulation such as heat, cold, light, pressure, or pain. React by initiating a chemical change or impulse. All-or-none principle Means that no transmission occurs until stimulus reaches a set minimum strength, which can vary for different receptors. Once the minimum stimulus or threshold is reached, a maximum impulse is produced. All-or-none principle Impulse is transmitted via a synapse, a specialized knoblike branch ending, with the help of chemical agents (neurotransmitters), across a synaptic cleft. Synaptic cleft separates the axon's end knobs from dendrites of the next neuron or from a motor end plate attached to a muscle.

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