Book excerpt: Human physiology is the science of the mechanical, physical, and biochemical functions of humans. Physiology is the most fascinating and ancient branch of science. It unfolds the mystery of complicated functions of the body system and individual organs in the body. The basic physiological functions include, provision of oxygen and nutrients, removal of metabolites and other waste products, maintenance of blood pressure and body temperature, locomotor functions and sensory functions, reproduction and intellectual functions like learning and memory. Amply illustrated the book briefly provides all the aspects of Human Physiology. Students pursuing Nursing, Physiotherapy and Biotechnology Engineering courses will find this book very useful.