If there is one over-riding concept in Biology, it is survival.For the individual to survive, internal environment plays a vital role hence must be maintained.Despite of all efforts, the usual pattern may be disrupted by any undesirable change in life events.This book aims at evaluating the physiological activities and correlate them to the blood parameters under influence of such changes. In the book, the author has tried to present a comprehensive coverage of the subject of toxicology which recognizes the needs of the varied groups who take the course.The material is presented with the frank intent of arousing the interest of the student and of maintaining it throughout. The book is written in three parts.In the first part, the author has penned down the cause and effects of physical stress-Loading density, Exercise and Heat shock;in the second part that of chemical stress-Sodium benzoate and Lead chromate on blood parameters-TEC, Hb, Urea, Albumin and Total Protein.The last part has been written on Liver toxicity.Swiss albino mice has been chosen as the target animal. The book is a carefully organized and written text for students majoring in the biological science discipli