Hello Amrit De,

The best book to study Physiology as per Medical Perspective is Tortora's Principle Of Anatomy And Physiology by Gerald Tortora and Bryan Derrickson. It is widely used book not only by MBBS students but also by Researchers. Very easy to understand language with labelled diagrams.

The PDF link am providing below,

https://www.academia.edu/36004776/PRINCIPLES_OF_ANATOMY_AND_PHYSIOLOGY_Tortora_14th_Ed

BEST WISHES!