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.
Speed of Impulses. Neurones send messages electrochemically; this means that chemicals (ions) cause an electrical impulse. Neurones and muscle cells are electrically excitable cells, which means that they can transmit electrical nerve impulses. These impulses are due to events in the cell membrane, so to understand the nerve impulse we need to revise some properties of cell membranes.