Books and Articles. 1  Baker, George E., editor The Works of William H. Seward, (Redfield, 1853-84). 2  Bancroft, Frederic, The Life of William H. Seward, (Harper & Brothers, 1900). 3  Estrem, Andrew, The Statesmanship of William H. Seward as Seen in His Public Career Prior to 1861, (Lutheran Publishing House, 1892).
A nerve impulse is the relaying of a coded signal from a nerve cell to an effector (a muscle cell, a gland cell or another nerve cell) in response to a stimulus.
An impulse begins when a neuron is stimulated by another neuron or by a stimulus in the environment. The cell membranes begin to change the flow of ions and a reversal of charges, the action potential, results. An impulse that changes one neuron, changes the next.ppropriate responses are carried out by effectors (a muscle or gland). The Neuron. The neuron, a nerve cell, is the functional unit of the nervous system that carries the impulse (the message) to the appropriate part of the nervous system or interprets the impulse and allows a response.