Basic Tissue Types. All of the various tissues of the human body can be categorized into four basic tissue types. All organs are built of these four tissues, which have consistent characteristics and arrangements from organ to organ. Thus an appreciation of the major features of these four basic tissue types can greatly simplify your understanding of the cellular composition of the many organ systems. 1  OVERVIEW.
Definition of session for English Language Learners : a period of time that is used to do a particular activity : a formal meeting or series of meetings of a group of people (such as a court of law or legislature)
Terms & School Hours in the Us. The school year usually runs from early September until May or June (nine months) and is divided into âquartersâ or terms (semesters). Some schools use the quarter system, which comprises three sessions: fall (September to December), winter (January to March) and spring (March to May or June).