The primary emphasis in the book has been laid on the elementary principles for the students of Physiology studying in general science (BSc) and for those of paramedical courses. Several illustrations have been introduced here in the chapter on skeletal system since they are usually neglected by the students of general science. To give an idea of the development in medical science, these topics have been explained in the text: artificial blood, artificial heart valve, ICCU, monitoring system, heart-lung machine, extracorporeal circuit and pacemaker. The author has incorporated in the book more experiments than what could be found in any other average textbook to cater to the needs of the students of various disciples of different universities. The chapters are discussed in lucid language in the most comprehensive manner with ample illustrations.