Major purpose of this lecture is to presentation on Digestive System. The function of the Digestive System overall is processing food so that high energy molecules can be absorbed and residues eradicated. This lecture briefly explain the general functions and anatomy of the digestive tract and the individual organs of the system, including a discussion of the gross and microscopic anatomy. Finally Oral Cavity, Three pairs of Salivary Glands, Gross Anatomy of the Stomach with explanation and pictures.