This lecture discusses the basic principles of histology and methods of studying it, basic tissue structures in invertebrates and vertebrates (epithelial, connective, muscle and nerve tissue), tissues that make up the digestive system, tissues that make up the reproductive system, tissues that make up the respiratory system, tissues that make up the circulatory system, the tissues that make up the excretory system, the tissues that make up the endocrinological system, and are associated with the types of disorders that can occur. This course is delivered theoretically, working on case study assignments and practicing observing preparations, lecture methods, discussions, observations and research article literacy.