An elucidative account based on muscle cells and tissues has been presented to the readers in this book. It deals with basic aspects of contractile mechanism in skeletal and smooth muscle cells and also the function of melanocytes, which possess many properties common to those of smooth muscles. It also covers pathological aspects of cardiac and smooth muscle cell functions along with dealing with factors influencing structure and function of cardiac and smooth muscle cells and tissues. The content of this book is thought-provoking and informative for readers interested in basic, pathological and clinical aspects of muscle cells and tissues.