Do not count mispronunciations of difficult proper nouns in the oral reading pas-. sages as errors. You may pronounce these for the children if necessary. Also, do not. count as errors dialectical equivalents (nonstandard dialects); however, these should. be noted.
A galvanic cell is also called a voltaic cell. The spontaneous reactions in it provide the electric energy or current. Two half cells can be put together to form an electrolytic cell, which is used for electrolysis. In this case, electric energy is used to force nonsponaneous chemical reactions.
Depolarization occurs when the inside of the cell becomes more positive and the membrane potential moves toward threshold. If depolarization is sufficient, threshold is reached and the cell will undergo an action potential. Hyper polarization is the opposite - the inside of the cell becomes more negative and the membrane potential moves away from the threshold; the cell is therefore less likely to undergo an action potential.