The science of endocrinology forms the cornerstone of our understanding of how living organisms regulate and coordinate their physiological activities. Hormones and chemical regulators not only influence growth, development, and metabolism but also play an essential role in maintaining homeostasis, behavior, reproduction, and overall health. With rapid advancements in molecular biology, biochemistry, and clinical sciences, the study of endocrine systems has evolved into a fascinating and highly dynamic field.
This book has been designed to provide a comprehensive yet structured account of endocrine physiology and chemical regulation, tailored for undergraduate and postgraduate students of life sciences, zoology, physiology, and related disciplines. It integrates classical concepts with modern insights, thereby offering readers a balanced perspective of both foundational knowledge and recent developments in the field.
The text is organized into four major chapters. The first chapter introduces chemical regulators and gene action, highlighting the mechanisms of hormone action, hormone receptors, regulatory substances, and analytical techniques of hormone assay. The second chapter elaborates on the hypothalamus, pituitary, and pineal glands, focusing on their structure, functions, and roles in neuro-endocrine integration and behavioral regulation. The third chapter deals with the thyroid and adrenal glands, explaining their organization, biosynthesis of hormones, regulatory mechanisms, and clinical disorders. The final chapter encompasses the endocrine pancreas, gonads, and gastrointestinal hormones, with emphasis on insulin biochemistry, glucose homeostasis, reproductive endocrinology, and the role of hormones in lifestyle disorders such as obesity, stress, and diabetes.
Each chapter has been carefully structured to ensure clarity and logical progression of topics. Emphasis has been placed on conceptual understanding as well as on the physiological and clinical implications of hormonal regulation. Wherever relevant, recent advances in endocrinology, including molecular mechanisms, gene regulation, and hormone therapy, have been incorporated.
It is hoped that this book will serve as a valuable resource for students, educators, and researchers who seek a clear and comprehensive understanding of endocrine systems. It may also prove useful for aspirants preparing for competitive examinations in the fields of biology and medical sciences.
The preparation of this book has been guided by the vision of making complex biological processes accessible and meaningful for learners. Suggestions, constructive feedback, and critical reviews from readers are most welcome and will be invaluable for improving future editions.