This is the new edition of the classic introductory text to electrophysiology. It covers many topics that are central to the field including the electrical properties of the cell membrane and cardiac electrophysiology. Organized as a textbook for the student needing to acquire the core competencies, this book meets the demands of advanced undergraduate or graduate coursework in biomedical engineering and biophysics. New features include extra, detailed illustrations. The book is authored by two eminent biomedical engineering professors at Duke University who discuss many topics that are central to biophysics and bioengineering and the quantitative methods employed.