BIOL 1107 Study Guide - Final Guide: Clonal Selection, Immunoglobulin A, Mast Cell
Document Summary
Chapter 43 - part 1: compare the two coordinating systems in animals: the central nervous and. Pass signals from one neuron to another: motor neurons: nerve cells that send signals to effector cells in glands or muscles, describe the function and location of each type of supporting cell: the na+ / k+ - Atpase pumps sodium out and potassium located in the cell membrane. Neurons produce action potentials that allow them to communicate with other neurons, muscles, or glands: an action potential occurs because specific ion channels in the plasma membrane open or close in response to changes in membrane voltage. There"s a short depolarization of the membrane from negative to 0, then briefly positive. Next, repolarization rapidly changes the membrane potential back to negative. Hyperpolarization causes the membrane to be slightly more negative than the resting potential. As the positive charges move away from the sodium channels, they depolarize adjacent portions of the membrane.