Sharir Kriya is the science which deals with the normal function of the human body and its parts. It involves understanding human physiology along with the principles of functions of the human body from an Ayurvedic perspective.
Studying ‘Kriya Sharir’ (Physiology) is very important as it is the base of treating any disease.Ayurveda is concepts of Sharir Kriya deals with the functions of Dosh, Dhatu and Malas.
Sharir Shashtra was not included in Ashtanga Ayurveda in those days due to its inclusion in Kayachikitsa. But nowadays it is a part of shodashanga of Ayurveda.