ATP synthase or Complex V spans the inner mitochondrial membrane. ATP synthase and respiratory chain are biochemically SEPARATE systems and they are linked only by PROTON MOTIVE FORCE. Proton motive force is generated by electron transport.
ATP synthase resembles a ball on a stick which locates in the inner mitochondrial membrane. The answer is FO rotor.
Microscopic anatomy
The study that uses microscopes to see the minute details of organ parts is called microscopic anatomy.
Microscopic anatomy is the study of cells, tissues and organs of the body that are too small to been seen with the naked eye. Microscopic anatomy usually involves using special staining techniques, combined with electron or light microscope. The use of stains helps to improve colors so that the cells can be more easily identified when they are examined.