Onkyo's website refers to this unit as a 7.2-channel receiver. It is clear from one of your photographs, but from no text in the review, that the height speaker terminals can be used as rear surround speaker terminals instead, for a 7.1 (or 7.2) channel setup.
In many cases, the students dissect human corpses (cadavers). Microscopic anatomy, also known as histology, is the study of cells and tissues of animals, humans and plants that are too small to been seen with the naked eye.
Histology, which is the microscopic study of tissues, would not be possible without the use of microscopes. A histologist will be able to learn valuable information with regards to the functional morphology of both human beings and animal. This helps with important discoveries concerning the cells and body systems. See Histology Slides. The importance of microscopes in life sciences can never be overestimated. Following the discovery of blood cells among other micro-organisms, many other discoveries were made through the use of advanced instruments.