INTRODUCTION OF PHYSIOLOGY PHT 214 By: Mrs. Nidaa Alanazi HUMAN BODY The human body is formed of many systems; nervous, muscular, skeletal, digestive, respiratory, cardiovascular, urinary, reproductive, and endocrine systems. CONT. Each system is formed of many organs; e.g. the digestive system is formed of the mouth, pharynx, oesophagus, stomach, small intestine, large intestine, in addition to the salivary glands, liver and pancreas. CONT. Each organ is formed of many tissues; e.g. the stomach is formed of muscular, nervous, epithelial and connective tissues. CONT. Each tissue is formed of many cells, so the cell is the structural and functional unit of body. The function of the cell differs according to its type and site. SO WHAT IS PHYSIOLOGY? WHAT IS PHYSIOLOGY ? Is the study of the functions of different body parts, and the physical relationships involved between body systems.