K Sembulingam - Essentials of Medical Physiology 6th Edition

Physiology is the most fascinating and ancient branch of science. It is fascinating because, it unfolds the mystery of
complicated functional aspects of individual organs in the body. It is ancient because, it exists ever since the origin
of life. Even before knowing the language, culture and society, man knew about the hunger, thirst, pain and fear
which are the basics of physiology.
Physiology is defined as the study of functions of various systems and different organs of the body. Physiology
is of different types namely, Human Physiology, Animal Physiology and Plant Physiology. Human Physiology and
Animal Physiology are very much inter-related. Knowledge of Human Physiology is essential to understand the other
allied subjects like Biochemistry, Pharmacology, Pathology, Medicine, etc. However, it is worthwhile to have a brief
know ledge of anatomy of different systems and various organs to understand the principles of Human Physiology.
The basic physiological functions include, provision of oxygen and nutrients, removal of metabolites and other
waste products, maintenance of blood pressure and body temperature, hunger and thirst, locomotor functions, special
sensory functions, reproduction and the higher intellectual functions like learning and memory.

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