The need for publishing acomprehensive review ofa number ofdifferent membrane pathologiesofmuscleand non-musclecells inillnesses ranging from diabetes toheart disease and cancer lies on to the fact that there are several books dealing with the properties ofnormal cell membranes, although there are very few books focussing on the abnormal membrane behavior. Since the membrane is the critical outer barrier of a cell, this membrane could be the first structure to be affected in some diseases. Research is advancing at the cellular level at a very rapid rate. We can now address questions such as: "How and by what is the mechanism underlying membrane ion channel and receptor dysfunction leading to abnormal cell function?" and "What substances cause dysfunction in specific ion channels or receptors?". Such questions bring together the microscopic worldof thecell with the macroscopic manifestation of disease. We believe that a book such as this one would help researchers, physicians, and students to better understand the relationship between cell membrane dysfunction and abnormal function of the cell and tissue. This book is intended for practicing clinicians and academic researchers, as well as resident physicians, medical studentsandgraduatestudents. Hopefully, suchtreatisewillhelp to fill an important gap between basic science and clinical science. We are greatly indebted to all thedistinguishedandhigWy-qualified researchers from university and industrial milieus who contributed to this book. Finally, we would like to thank the publishers for their confidenceand cooperation in making this book available for the medical sciences.