This book is intended to suit the needs of students enrolled in B.Sc. and B.A. Home Science course. The major goal of the book is to convey the fundamental ideas of human physiology in a way that will make the topic clear, lucid, and simple for the students of Home Science by omitting unnecessary details. The book discusses a wide range of topics, including Animal cell structure, different organ systems, and their functions. Diagrams are used to clarify a variety of concepts.