In tracing their origin and their fate, the beginning and the end of their environment, humans have often been guided by curiosity. Such concern has helped man to discover, among other things, the structure of the universe from star to atom and the evolution of life from unicellular organism to human being. The study of disease is unique. Although it may have been in­ spired by the curiosity of a few, it has always been the concern of all, because preventing or curing disease has meant survival not only of individuals, but of entire nations, not only of humans, but of fellow living creatures. If greed, force, religion, and language have been major causes of wars, diseases, more than arms, have often decided the outcome of battles and thereby have woven the pattern of history. For millennia, a large fraction of the human race believed that disease expressed the wrath of God(s) against individuals or societies. Therefore, only priests or priestesses, kings, and queens were endowed with the power of healing. In the West, Hippocrates is credited for exorcising this concept of disease and for objectively describing and cataloguing them. The contributions of Greek physicians to Western medicine made possible more accurate diagnoses and prognoses.

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1 The Concept of Disease and Its History.- Prehistoric Times.- Egypt, Greece, and Rome.- Medieval Times.- The Foundation of Modern Pathology.- The Renaissance.- The Great Schools of Medicine in the 18th and 19th Centuries.- Cellular Pathology.- The Origins of Chemical Pathology.- Alchemy.- Renaissance Chemistry and Medicine.- Discovery of Oxygen and Respiration.- The 19th Century.- 2 Development of Existing Knowledge.- Gene Expression.- Cell Structure.- Molecular Organization.- Nucleus.- Cytoplasm.- Endoplasmic Reticulum.- The Cytosol and Glycolysis.- Mitochondria and Aerobic Pathways.- Other Cytoplasmic Organelles.- Cell Membrane.- Intercellular Integration.- Microscopic Features.- Nervous System.- Chemical Messengers.- Circulatory System.- Conclusion.- 3 Defense Mechanisms.- First Line of Defense.- Blood Coagulation, Inflammation, and Immunity.- Blood Coagulation.- Inflammation.- Immunity.- Restoration of Lost Tissues.- Wound Healing.- Fractures.- Hypertrophy and Hyperplasia.- 4 Causes of Disease.- Hereditary Diseases.- Congenital Anomalies.- Conflict with the Environment.- Trauma.- Toxins.- Biological Agents.- Nutritional Deficiencies.- Hormonal Imbalances.- Body Fluids and Electrolyte Imbalances.- Remarks on Origin of Life.- Water and Sodium Balance.- Defective Defense Mechanisms.- Excessive Response to Injury.- Conclusion.- 5 Injuries to Units of Specificity.- Primary Injury to DNA.- DNA Repair.- Consequences of Injuries to DNA.- Inherited Mutations.- Somatic Mutations.- Interference with DNA Synthesis.- Enzymic Block.- Substrate Depletion.- Antimetabolites.- Injuries to Transcription.- Pathology of Translation.- Conclusion.- 6 Injuries to Catalytic Units.- About Atoms and Molecules.- About Chemical Reactions.- About Enzyme Reactions.- Life Cycle of Enzymes.- Pathology of the Catalytic Unit.- Absence of Enzyme Molecules.- Defective Enzymes.- Increased Enzyme Activity.- Defective Enzyme Regulation.- Defects in Coenzymes.- Metal Deficiency.- Enzyme Inhibition.- Disease and Substrate Alteration.- Substrate Deficiency.- Substrate Excess.- Conclusion.- 7 Hormone Imbalance.- Endocrine Glands.- Mode of Action of Hormones.- Regulation of Hormone Secretion.- Second Messengers.- Hormone Degradation.- Hormonal Diseases.- Absence of Endocrine Organs.- Nutritional Deficiencies and Goiters.- Defects in Hormone Synthesis.- Defects in Hormone Transport.- Receptor Defects.- Regulatory Defects.- Glandular Hyperplasia.- 8 Pathology of Cell Membranes.- Function of the Plasma Membrane.- Transport.- Movement.- Adhesion.- Cell Communications.- Regulation of Cellular Metabolism.- Structure of Cell Membranes.- Molecular Organization of the Cell Membrane.- Biosynthesis of the Cell Membrane.- The Cytocavitary Network.- Endoplasmic Reticulum.- Lysosomes.- Peroxisomes.- Mitochondria.- Pathology of Cell Membranes.- Structural Injuries.- Functional Injuries.- Conclusion.- 9 Reflections on Cellular Death.- Primary, Secondary, and Critical Injuries.- Programmed Death.- Provoked Death.- Molecular Mechanisms in Provoked Death.- The Point of No Return.- Catabolic Enzymes and Cellular Death.- Correlation of Some Morphological and Biochemical Events in Cellular Death.- Conclusion.- 10 The Great Killers, Atherosclerosis and Cancer.- Atherosclerosis.- Pathogenesis.- Coronary Heart Disease.- Cerebral Consequences of Atherosclerosis.- Concluding Remarks on Atherosclerosis.- Cancer.- Clinical Pathology of Cancer.- Pathogenesis of Cancer.- Chemical Transformation in Vitro.- Carcinogens in Humans.- Cancers and Viruses in Humans.- 11 Aging.- Manifestations of Aging.- Possible Cellular Mechanisms in Aging.- Biological Causes of Aging.- Programmed Aging.- Somatic Mutations and Aging.- Immunologic Theory of Aging.- Conclusion.