Synopsis Initially these courses were of introductory in nature. During this period, we had published books like ' Fundamental Principles of Ayurveda', 'Natural Healing Through Ayurveda.' These books were sufficient for giving the basic knowledge of Ayurveda. Now complete ayurvedic courses are being conducted at various Institutes throughout the World. Ayurveda is becoming popular and students are naturally demanding more and more books for various subjects for deeper study of Ayurveda. We therefore felt it necessary to write this book explaining all the topics on Physiology or Sharira Kriya for the students as well for enthusiastic readers. In this book we have covered all the topics starting form the Introduction. Fundamental Principles to the description of dosha, Dhatu and mala as well as detail description of srotas - channel systems. We have given detail description regarding digestion and metabolism as well as various aspects in comparison with science of Yoga and important topics like oja and mind.