Health and Disease of the Cardiovascular System: Chapter 6,7,8: Physiology, Coronary Regional Circulations, Adjustments

The cardiovascular system is the central engine of human physiology, sustaining life through the continuous delivery of oxygen and nutrients while removing metabolic waste. Its complexity lies not only in the anatomy of the heart and vessels but also in the dynamic regulation of blood flow across diverse organs and under varying physiological demands. This volume-Chapters 6, 7, and 8-is designed to provide medical students with a comprehensive, integrated understanding of cardiovascular physiology, coronary and regional circulations, and adaptive mechanisms during postural and systemic challenges.- Chapter 6: Physiology explores fundamental cardiac function, hemodynamics, and the principles of vascular regulation.- Chapter 7: Coronary and Regional Circulations examines specialized circulatory territories-coronary, cerebral, hepatic, renal, splanchnic, and cutaneous-highlighting their unique regulatory mechanisms and clinical correlations.- Chapter 8: Cardiovascular Adjustments focuses on postural changes, orthostatic hypotension, autoregulation, and integrated clinical applications, bridging physiology with patient care.The content is structured with hierarchical modular subsections, clinical correlations, tables, and checklists, ensuring clarity and accessibility. Each concept is explained using Richard Feynman's first-principles reasoning, enabling learners to grasp not only "what" happens but "why" it must happen. This book is written with the conviction that medical education must be original, publication-ready, and ethically compliant. No part of referenced resources has been directly copied in violation of copyright ownership; instead, all material has been synthesized into fresh academic explanations aligned with global standards. It is my hope that these chapters will serve as a foundation for MBBS Phase I and II students, a reference for clinicians, and a springboard for researchers seeking to understand the cardiovascular system in health and disease.