AAET NCV/EMG Review Questions and Answers

Ion What describes an atom in which the total number of electrons is not equal to the total number of protons, giving the atom a net positive or negative electrical charge? Electron What is the negatively charged particle in an atom? Neutrons What has neutral particles, along with protons, and is found in the nucleus of an atom? Protons Which particles of an atom are positively charged? Atoms What makes up the elements found in all matter? -90 to -70mV What is the voltage inside the nerve cell membrane in a resting membrane potential? Sodium What is the major ion outside a cell membrane? Potassium What is the major ion inside a cell membrane? All Or None Response What is the physiological term when depolarization occurs it causes a muscle and/or nerve fiber to either respond to a stimulus completely if it reaches threshold or no response if the depolarization is insufficient to reach threshold? Depolarization What describes changing from a resting potential or polarized state to an excited state? Depolarization What causes the inside of the cell to be more positively charged relative to its resting state? Repolarization What describes when nerve cells are changed from an excited state back to a resting electrical potential or polarized state? Hyperpolarization What causes the inside of the cell to be more negatively charged relative to its resting state? Absolute Refractory Period During the repolarization phase, sodium channels become inactivated and cannot be opened no matter how much depolarization occurs